161200065700551 has 16 divisors (see below), whose sum is σ = 215617576978944. Its totient is φ = 107125130016864.

The previous prime is 161200065700549. The next prime is 161200065700591. The reversal of 161200065700551 is 155007560002161.

It is a happy number.

It is not a de Polignac number, because 161200065700551 - 2¹ = 161200065700549 is a prime.

It is a super-2 number, since 2×161200065700551² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161200065700591) 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, 60899940 + ... + 63491753.

It is an arithmetic number, because the mean of its divisors is an integer number (13476098561184).

Almost surely, 2^{161200065700551} is an apocalyptic number.

161200065700551 is a deficient number, since it is larger than the sum of its proper divisors (54417511278393).

161200065700551 is a wasteful number, since it uses less digits than its factorization.

161200065700551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124393070.

The product of its (nonzero) digits is 63000, while the sum is 39.

The spelling of 161200065700551 in words is "one hundred sixty-one trillion, two hundred billion, sixty-five million, seven hundred thousand, five hundred fifty-one".