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161566510056051 = 3139563688187681
BaseRepresentation
bin100100101111000110100010…
…011100001000001001110011
3210012001121101212202002202210
4210233012202130020021303
5132134101203033243201
61331342344032143203
746013536510101342
oct4457064234101163
9705047355662683
10161566510056051
1147530a76995141
1216154809397b03
136c1c86c4c9c89
142bc7c0a0c9b59
1513a2ab075a1d6
hex92f1a2708273

161566510056051 has 16 divisors (see below), whose sum is σ = 217357197482880. Its totient is φ = 106746167420160.

The previous prime is 161566510056047. The next prime is 161566510056143. The reversal of 161566510056051 is 150650015665161.

It is not a de Polignac number, because 161566510056051 - 22 = 161566510056047 is a prime.

It is a super-2 number, since 2×1615665100560512 (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161566510056001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343859070 + ... + 344328611.

It is an arithmetic number, because the mean of its divisors is an integer number (13584824842680).

Almost surely, 2161566510056051 is an apocalyptic number.

161566510056051 is a deficient number, since it is larger than the sum of its proper divisors (55790687426829).

161566510056051 is a wasteful number, since it uses less digits than its factorization.

161566510056051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688188386.

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 161566510056051 in words is "one hundred sixty-one trillion, five hundred sixty-six billion, five hundred ten million, fifty-six thousand, fifty-one".

Divisors: 1 3 139 417 563 1689 78257 234771 688187681 2064563043 95658087659 286974262977 387449664403 1162348993209 53855503352017 161566510056051