15656640213 has 8 divisors (see below), whose sum is σ = 21217742176. Its totient is φ = 10266649200.

The previous prime is 15656640187. The next prime is 15656640221. The reversal of 15656640213 is 31204665651.

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

It is not a de Polignac number, because 15656640213 - 2¹² = 15656636117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15656640253) 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, 42777523 + ... + 42777888.

It is an arithmetic number, because the mean of its divisors is an integer number (2652217772).

Almost surely, 2^15656640213 is an apocalyptic number.

It is an amenable number.

15656640213 is a deficient number, since it is larger than the sum of its proper divisors (5561101963).

15656640213 is an equidigital number, since it uses as much as digits as its factorization.

15656640213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85555475.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 15656640213 in words is "fifteen billion, six hundred fifty-six million, six hundred forty thousand, two hundred thirteen".