51551555121 has 96 divisors (see below), whose sum is σ = 85553095680. Its totient is φ = 29626560000.

The previous prime is 51551555119. The next prime is 51551555147. The reversal of 51551555121 is 12155515515.

51551555121 is a `hidden beast` number, since 5 + 1 + 551 + 55 + 51 + 2 + 1 = 666.

It is not a de Polignac number, because 51551555121 - 2¹ = 51551555119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51551555521) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 95289111 + ... + 95289651.

It is an arithmetic number, because the mean of its divisors is an integer number (891178080).

Almost surely, 2^51551555121 is an apocalyptic number.

It is an amenable number.

51551555121 is a deficient number, since it is larger than the sum of its proper divisors (34001540559).

51551555121 is a wasteful number, since it uses less digits than its factorization.

51551555121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159 (or 1156 counting only the distinct ones).

The product of its digits is 31250, while the sum is 36.

The spelling of 51551555121 in words is "fifty-one billion, five hundred fifty-one million, five hundred fifty-five thousand, one hundred twenty-one".