75516640521 has 36 divisors (see below), whose sum is σ = 120054697776. Its totient is φ = 42099731520.

The previous prime is 75516640447. The next prime is 75516640543. The reversal of 75516640521 is 12504661557.

It is not a de Polignac number, because 75516640521 - 2¹⁹ = 75516116233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (75516640621) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 94306 + ... + 399908.

It is an arithmetic number, because the mean of its divisors is an integer number (3334852716).

Almost surely, 2^75516640521 is an apocalyptic number.

It is an amenable number.

75516640521 is a deficient number, since it is larger than the sum of its proper divisors (44538057255).

75516640521 is a wasteful number, since it uses less digits than its factorization.

75516640521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305702 (or 305654 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 75516640521 in words is "seventy-five billion, five hundred sixteen million, six hundred forty thousand, five hundred twenty-one".