10156111661 has 8 divisors (see below), whose sum is σ = 10860002424. Its totient is φ = 9464051200.

The previous prime is 10156111577. The next prime is 10156111687. The reversal of 10156111661 is 16611165101.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4254952900 + 5901158761 = 65230^2 + 76819^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10156111661 - 2²⁶ = 10089002797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10156116661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2955800 + ... + 2959233.

It is an arithmetic number, because the mean of its divisors is an integer number (1357500303).

Almost surely, 2^10156111661 is an apocalyptic number.

It is an amenable number.

10156111661 is a deficient number, since it is larger than the sum of its proper divisors (703890763).

10156111661 is a wasteful number, since it uses less digits than its factorization.

10156111661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5915151.

The product of its (nonzero) digits is 1080, while the sum is 29.

Adding to 10156111661 its reverse (16611165101), we get a palindrome (26767276762).

The spelling of 10156111661 in words is "ten billion, one hundred fifty-six million, one hundred eleven thousand, six hundred sixty-one".