51550561560 has 64 divisors (see below), whose sum is σ = 154669639680. Its totient is φ = 13745220480.

The previous prime is 51550561523. The next prime is 51550561583. The reversal of 51550561560 is 6516505515.

It is a congruent number.

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, 1309119 + ... + 1347921.

It is an arithmetic number, because the mean of its divisors is an integer number (2416713120).

Almost surely, 2^51550561560 is an apocalyptic number.

It is an amenable number.

51550561560 is an abundant number, since it is smaller than the sum of its proper divisors (103119078120).

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

51550561560 is a wasteful number, since it uses less digits than its factorization.

51550561560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49888 (or 49884 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 39.

The spelling of 51550561560 in words is "fifty-one billion, five hundred fifty million, five hundred sixty-one thousand, five hundred sixty".