15551308920 has 128 divisors (see below), whose sum is σ = 54069949440. Its totient is φ = 3504506880.

The previous prime is 15551308867. The next prime is 15551308933. The reversal of 15551308920 is 2980315551.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70737 + ... + 190016.

It is an arithmetic number, because the mean of its divisors is an integer number (422421480).

Almost surely, 2^15551308920 is an apocalyptic number.

15551308920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15551308920 is an abundant number, since it is smaller than the sum of its proper divisors (38518640520).

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

15551308920 is a wasteful number, since it uses less digits than its factorization.

15551308920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260845 (or 260841 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 39.

The spelling of 15551308920 in words is "fifteen billion, five hundred fifty-one million, three hundred eight thousand, nine hundred twenty".