15613650641 has 4 divisors (see below), whose sum is σ = 15631955892. Its totient is φ = 15595345392.

The previous prime is 15613650601. The next prime is 15613650677. The reversal of 15613650641 is 14605631651.

15613650641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1821497041 + 13792153600 = 42679^2 + 117440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15613650641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15613650595 and 15613650604.

It is not an unprimeable number, because it can be changed into a prime (15613650601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9151346 + ... + 9153051.

It is an arithmetic number, because the mean of its divisors is an integer number (3907988973).

Almost surely, 2^15613650641 is an apocalyptic number.

It is an amenable number.

15613650641 is a deficient number, since it is larger than the sum of its proper divisors (18305251).

15613650641 is an equidigital number, since it uses as much as digits as its factorization.

15613650641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18305250.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 15613650641 in words is "fifteen billion, six hundred thirteen million, six hundred fifty thousand, six hundred forty-one".