51475985597 has 4 divisors (see below), whose sum is σ = 51507979740. Its totient is φ = 51443991456.

The previous prime is 51475985593. The next prime is 51475985621. The reversal of 51475985597 is 79558957415.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47294940676 + 4181044921 = 217474^2 + 64661^2 .

It is a cyclic number.

It is not a de Polignac number, because 51475985597 - 2² = 51475985593 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51475985593) 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, 15994658 + ... + 15997875.

It is an arithmetic number, because the mean of its divisors is an integer number (12876994935).

Almost surely, 2^51475985597 is an apocalyptic number.

It is an amenable number.

51475985597 is a deficient number, since it is larger than the sum of its proper divisors (31994143).

51475985597 is a wasteful number, since it uses less digits than its factorization.

51475985597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31994142.

The product of its digits is 79380000, while the sum is 65.

The spelling of 51475985597 in words is "fifty-one billion, four hundred seventy-five million, nine hundred eighty-five thousand, five hundred ninety-seven".