15490072865 has 4 divisors (see below), whose sum is σ = 18588087444. Its totient is φ = 12392058288.

The previous prime is 15490072837. The next prime is 15490072891. The reversal of 15490072865 is 56827009451.

It is a happy number.

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 11898228241 + 3591844624 = 109079^2 + 59932^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15490072865 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1549007282 + ... + 1549007291.

It is an arithmetic number, because the mean of its divisors is an integer number (4647021861).

Almost surely, 2^15490072865 is an apocalyptic number.

It is an amenable number.

15490072865 is a deficient number, since it is larger than the sum of its proper divisors (3098014579).

15490072865 is an equidigital number, since it uses as much as digits as its factorization.

15490072865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3098014578.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 15490072865 in words is "fifteen billion, four hundred ninety million, seventy-two thousand, eight hundred sixty-five".