15216136491 has 16 divisors (see below), whose sum is σ = 21405565440. Its totient is φ = 9587878560.

The previous prime is 15216136487. The next prime is 15216136513. The reversal of 15216136491 is 19463161251.

It is not a de Polignac number, because 15216136491 - 2² = 15216136487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15216136591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285120 + ... + 334253.

It is an arithmetic number, because the mean of its divisors is an integer number (1337847840).

Almost surely, 2^15216136491 is an apocalyptic number.

15216136491 is a deficient number, since it is larger than the sum of its proper divisors (6189428949).

15216136491 is a wasteful number, since it uses less digits than its factorization.

15216136491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619826.

The product of its digits is 38880, while the sum is 39.

The spelling of 15216136491 in words is "fifteen billion, two hundred sixteen million, one hundred thirty-six thousand, four hundred ninety-one".