75640057521 has 16 divisors (see below), whose sum is σ = 121327411200. Its totient is φ = 40948000848.

The previous prime is 75640057511. The next prime is 75640057547. The reversal of 75640057521 is 12575004657.

It is a happy number.

It is not a de Polignac number, because 75640057521 - 2⁷ = 75640057393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (75640057511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94786641 + ... + 94787438.

It is an arithmetic number, because the mean of its divisors is an integer number (7582963200).

Almost surely, 2^75640057521 is an apocalyptic number.

It is an amenable number.

75640057521 is a deficient number, since it is larger than the sum of its proper divisors (45687353679).

75640057521 is a wasteful number, since it uses less digits than its factorization.

75640057521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189574108.

The product of its (nonzero) digits is 294000, while the sum is 42.

The spelling of 75640057521 in words is "seventy-five billion, six hundred forty million, fifty-seven thousand, five hundred twenty-one".