51504475057 has 4 divisors (see below), whose sum is σ = 58862257216. Its totient is φ = 44146692900.

The previous prime is 51504475039. The next prime is 51504475073. The reversal of 51504475057 is 75057440515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75057440515 = 5 ⋅15011488103.

It is a cyclic number.

It is not a de Polignac number, because 51504475057 - 2⁷ = 51504474929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51504475007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3678891069 + ... + 3678891082.

It is an arithmetic number, because the mean of its divisors is an integer number (14715564304).

Almost surely, 2^51504475057 is an apocalyptic number.

It is an amenable number.

51504475057 is a deficient number, since it is larger than the sum of its proper divisors (7357782159).

51504475057 is an equidigital number, since it uses as much as digits as its factorization.

51504475057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7357782158.

The product of its (nonzero) digits is 490000, while the sum is 43.

The spelling of 51504475057 in words is "fifty-one billion, five hundred four million, four hundred seventy-five thousand, fifty-seven".