51551405554 has 16 divisors (see below), whose sum is σ = 85054013856. Its totient is φ = 23432455860.

The previous prime is 51551405539. The next prime is 51551405561. The reversal of 51551405554 is 45550415515.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9680172 + ... + 9685495.

It is an arithmetic number, because the mean of its divisors is an integer number (5315875866).

Almost surely, 2^51551405554 is an apocalyptic number.

51551405554 is a deficient number, since it is larger than the sum of its proper divisors (33502608302).

51551405554 is a wasteful number, since it uses less digits than its factorization.

51551405554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19365702 (or 19365680 counting only the distinct ones).

The product of its (nonzero) digits is 250000, while the sum is 40.

The spelling of 51551405554 in words is "fifty-one billion, five hundred fifty-one million, four hundred five thousand, five hundred fifty-four".