51111955000 has 160 divisors (see below), whose sum is σ = 122207880960. Its totient is φ = 20029680000.

The previous prime is 51111954923. The next prime is 51111955039. The reversal of 51111955000 is 55911115.

It is a super-2 number, since 2×51111955000² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51111955000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 90784719 + ... + 90785281.

It is an arithmetic number, because the mean of its divisors is an integer number (763799256).

Almost surely, 2^51111955000 is an apocalyptic number.

51111955000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51111955000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61103940480).

51111955000 is an abundant number, since it is smaller than the sum of its proper divisors (71095925960).

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

51111955000 is a wasteful number, since it uses less digits than its factorization.

51111955000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 1125, while the sum is 28.

The spelling of 51111955000 in words is "fifty-one billion, one hundred eleven million, nine hundred fifty-five thousand".