55721121512 has 16 divisors (see below), whose sum is σ = 119402403360. Its totient is φ = 23880480624.

The previous prime is 55721121503. The next prime is 55721121593. The reversal of 55721121512 is 21512112755.

It is a super-2 number, since 2×55721121512² (a number of 22 digits) contains 22 as substring.

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, 497509958 + ... + 497510069.

It is an arithmetic number, because the mean of its divisors is an integer number (7462650210).

Almost surely, 2^55721121512 is an apocalyptic number.

It is an amenable number.

55721121512 is an abundant number, since it is smaller than the sum of its proper divisors (63681281848).

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

55721121512 is a wasteful number, since it uses less digits than its factorization.

55721121512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995020040 (or 995020036 counting only the distinct ones).

The product of its digits is 7000, while the sum is 32.

The spelling of 55721121512 in words is "fifty-five billion, seven hundred twenty-one million, one hundred twenty-one thousand, five hundred twelve".