51113554220 has 48 divisors (see below), whose sum is σ = 113711024448. Its totient is φ = 19232839680.

The previous prime is 51113554213. The next prime is 51113554231. The reversal of 51113554220 is 2245531115.

It is a super-2 number, since 2×51113554220² (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 15 ways as a sum of consecutive naturals, for example, 639905 + ... + 715335.

It is an arithmetic number, because the mean of its divisors is an integer number (2368979676).

Almost surely, 2^51113554220 is an apocalyptic number.

It is an amenable number.

51113554220 is an abundant number, since it is smaller than the sum of its proper divisors (62597470228).

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

51113554220 is a wasteful number, since it uses less digits than its factorization.

51113554220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77450 (or 77448 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 51113554220 in words is "fifty-one billion, one hundred thirteen million, five hundred fifty-four thousand, two hundred twenty".