15615402161 has 8 divisors (see below), whose sum is σ = 15677295144. Its totient is φ = 15553549440.

The previous prime is 15615402113. The next prime is 15615402163. The reversal of 15615402161 is 16120451651.

It can be written as a sum of positive squares in 4 ways, for example, as 711875761 + 14903526400 = 26681^2 + 122080^2 .

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 15615402161 - 2¹⁴ = 15615385777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15615402163) 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, 942731 + ... + 959151.

It is an arithmetic number, because the mean of its divisors is an integer number (1959661893).

Almost surely, 2^15615402161 is an apocalyptic number.

It is an amenable number.

15615402161 is a deficient number, since it is larger than the sum of its proper divisors (61892983).

15615402161 is a wasteful number, since it uses less digits than its factorization.

15615402161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20131.

The product of its (nonzero) digits is 7200, while the sum is 32.

The spelling of 15615402161 in words is "fifteen billion, six hundred fifteen million, four hundred two thousand, one hundred sixty-one".