15216009649 has 8 divisors (see below), whose sum is σ = 15313277160. Its totient is φ = 15118849536.

The previous prime is 15216009637. The next prime is 15216009673. The reversal of 15216009649 is 94690061251.

It can be written as a sum of positive squares in 4 ways, for example, as 8460320400 + 6755689249 = 91980^2 + 82193^2 .

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 15216009649 - 2⁷ = 15216009521 is a prime.

It is a super-2 number, since 2×15216009649² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15216009619) 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, 267667 + ... + 319495.

It is an arithmetic number, because the mean of its divisors is an integer number (1914159645).

Almost surely, 2^15216009649 is an apocalyptic number.

It is an amenable number.

15216009649 is a deficient number, since it is larger than the sum of its proper divisors (97267511).

15216009649 is a wasteful number, since it uses less digits than its factorization.

15216009649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53699.

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 15216009649 in words is "fifteen billion, two hundred sixteen million, nine thousand, six hundred forty-nine".