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66617242063 = 471417388129
BaseRepresentation
bin111110000010101100…
…100111000111001111
320100221200002112100121
4332002230213013033
52042413003221223
650334210405411
74545560133421
oct760254470717
9210850075317
1066617242063
1126285772a59
1210ab1b90867
13638867a838
14331d656811
151aed66215d
hexf82b271cf

66617242063 has 4 divisors (see below), whose sum is σ = 68034630240. Its totient is φ = 65199853888.

The previous prime is 66617242061. The next prime is 66617242073. The reversal of 66617242063 is 36024271666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66617242063 - 21 = 66617242061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66617242061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 708694018 + ... + 708694111.

It is an arithmetic number, because the mean of its divisors is an integer number (17008657560).

Almost surely, 266617242063 is an apocalyptic number.

66617242063 is a deficient number, since it is larger than the sum of its proper divisors (1417388177).

66617242063 is a wasteful number, since it uses less digits than its factorization.

66617242063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417388176.

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 66617242063 in words is "sixty-six billion, six hundred seventeen million, two hundred forty-two thousand, sixty-three".

Divisors: 1 47 1417388129 66617242063