15165011661 has 4 divisors (see below), whose sum is σ = 20220015552. Its totient is φ = 10110007772.

The previous prime is 15165011639. The next prime is 15165011663. The reversal of 15165011661 is 16611056151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15165011661 - 2⁶ = 15165011597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15165011663) 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, 2527501941 + ... + 2527501946.

It is an arithmetic number, because the mean of its divisors is an integer number (5055003888).

Almost surely, 2^15165011661 is an apocalyptic number.

It is an amenable number.

15165011661 is a deficient number, since it is larger than the sum of its proper divisors (5055003891).

15165011661 is an equidigital number, since it uses as much as digits as its factorization.

15165011661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055003890.

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 15165011661 in words is "fifteen billion, one hundred sixty-five million, eleven thousand, six hundred sixty-one".