15755315521 has 16 divisors (see below), whose sum is σ = 17730168768. Its totient is φ = 13877899200.

The previous prime is 15755315483. The next prime is 15755315551. The reversal of 15755315521 is 12551355751.

It is a happy number.

It is not a de Polignac number, because 15755315521 - 2⁷ = 15755315393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15755315551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130270 + ... + 220183.

It is an arithmetic number, because the mean of its divisors is an integer number (1108135548).

Almost surely, 2^15755315521 is an apocalyptic number.

15755315521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15755315521 is a deficient number, since it is larger than the sum of its proper divisors (1974853247).

15755315521 is a wasteful number, since it uses less digits than its factorization.

15755315521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350592.

The product of its digits is 131250, while the sum is 40.

The spelling of 15755315521 in words is "fifteen billion, seven hundred fifty-five million, three hundred fifteen thousand, five hundred twenty-one".