10156611661 has 6 divisors (see below), whose sum is σ = 11814834030. Its totient is φ = 8705667096.

The previous prime is 10156611643. The next prime is 10156611667. The reversal of 10156611661 is 16611665101.

It can be written as a sum of positive squares in only one way, i.e., 8890604100 + 1266007561 = 94290^2 + 35581^2 .

It is not a de Polignac number, because 10156611661 - 2⁹ = 10156611149 is a prime.

It is a super-2 number, since 2×10156611661² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10156611667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103638846 + ... + 103638943.

It is an arithmetic number, because the mean of its divisors is an integer number (1969139005).

Almost surely, 2^10156611661 is an apocalyptic number.

It is an amenable number.

10156611661 is a deficient number, since it is larger than the sum of its proper divisors (1658222369).

10156611661 is an equidigital number, since it uses as much as digits as its factorization.

10156611661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207277803 (or 207277796 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 34.

The spelling of 10156611661 in words is "ten billion, one hundred fifty-six million, six hundred eleven thousand, six hundred sixty-one".