15550391525440 has 56 divisors (see below), whose sum is σ = 37375438779072. Its totient is φ = 6162024291840.

The previous prime is 15550391525413. The next prime is 15550391525479. The reversal of 15550391525440 is 4452519305551.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227045076 + ... + 227113555.

Almost surely, 2^{15550391525440} is an apocalyptic number.

15550391525440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15550391525440 is an abundant number, since it is smaller than the sum of its proper divisors (21825047253632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15550391525440 is a wasteful number, since it uses less digits than its factorization.

15550391525440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454158755 (or 454158745 counting only the distinct ones).

The product of its (nonzero) digits is 2700000, while the sum is 49.

The spelling of 15550391525440 in words is "fifteen trillion, five hundred fifty billion, three hundred ninety-one million, five hundred twenty-five thousand, four hundred forty".