51578325045 has 80 divisors (see below), whose sum is σ = 102262646640. Its totient is φ = 24706031616.

The previous prime is 51578325013. The next prime is 51578325061. The reversal of 51578325045 is 54052387515.

51578325045 is a `hidden beast` number, since 5 + 1 + 578 + 32 + 5 + 0 + 45 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 3835201041 + 47743124004 = 61929^2 + 218502^2 .

It is not a de Polignac number, because 51578325045 - 2⁵ = 51578325013 is a prime.

It is a super-2 number, since 2×51578325045² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 62421 + ... + 327189.

It is an arithmetic number, because the mean of its divisors is an integer number (1278283083).

Almost surely, 2^51578325045 is an apocalyptic number.

It is an amenable number.

51578325045 is a deficient number, since it is larger than the sum of its proper divisors (50684321595).

51578325045 is a wasteful number, since it uses less digits than its factorization.

51578325045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264836 (or 264827 counting only the distinct ones).

The product of its (nonzero) digits is 840000, while the sum is 45.

The spelling of 51578325045 in words is "fifty-one billion, five hundred seventy-eight million, three hundred twenty-five thousand, forty-five".