51671555220 has 24 divisors (see below), whose sum is σ = 144680354784. Its totient is φ = 13779081376.

The previous prime is 51671555213. The next prime is 51671555357. The reversal of 51671555220 is 2255517615.

51671555220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 430596234 + ... + 430596353.

It is an arithmetic number, because the mean of its divisors is an integer number (6028348116).

Almost surely, 2^51671555220 is an apocalyptic number.

It is an amenable number.

51671555220 is an abundant number, since it is smaller than the sum of its proper divisors (93008799564).

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

51671555220 is a wasteful number, since it uses less digits than its factorization.

51671555220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861192599 (or 861192597 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 39.

The spelling of 51671555220 in words is "fifty-one billion, six hundred seventy-one million, five hundred fifty-five thousand, two hundred twenty".