15520942081 has 8 divisors (see below), whose sum is σ = 16964066304. Its totient is φ = 14136720960.

The previous prime is 15520942049. The next prime is 15520942093. The reversal of 15520942081 is 18024902551.

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 15520942081 - 2⁵ = 15520942049 is a prime.

It is a super-2 number, since 2×15520942081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15520942081.

It is not an unprimeable number, because it can be changed into a prime (15520942181) 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, 14725225 + ... + 14726278.

It is an arithmetic number, because the mean of its divisors is an integer number (2120508288).

Almost surely, 2^15520942081 is an apocalyptic number.

It is an amenable number.

15520942081 is a deficient number, since it is larger than the sum of its proper divisors (1443124223).

15520942081 is a wasteful number, since it uses less digits than its factorization.

15520942081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29451551.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 15520942081 in words is "fifteen billion, five hundred twenty million, nine hundred forty-two thousand, eighty-one".