51520415553 has 24 divisors (see below), whose sum is σ = 77857616928. Its totient is φ = 34042970304.

The previous prime is 51520415539. The next prime is 51520415579. The reversal of 51520415553 is 35551402515.

51520415553 is a `hidden beast` number, since 51 + 52 + 0 + 4 + 1 + 5 + 553 = 666.

It is not a de Polignac number, because 51520415553 - 2¹⁶ = 51520350017 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51520415503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 910675 + ... + 965592.

It is an arithmetic number, because the mean of its divisors is an integer number (3244067372).

Almost surely, 2^51520415553 is an apocalyptic number.

It is an amenable number.

51520415553 is a deficient number, since it is larger than the sum of its proper divisors (26337201375).

51520415553 is a wasteful number, since it uses less digits than its factorization.

51520415553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876395 (or 1876383 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The spelling of 51520415553 in words is "fifty-one billion, five hundred twenty million, four hundred fifteen thousand, five hundred fifty-three".