75508994521 has 9 divisors (see below), whose sum is σ = 76238334333. Its totient is φ = 74786574240.

The previous prime is 75508994489. The next prime is 75508994593. The reversal of 75508994521 is 12549980557.

The square root of 75508994521 is 274789.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 20949378121 + 54559616400 = 144739^2 + 233580^2 .

It is not a de Polignac number, because 75508994521 - 2⁵ = 75508994489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75508994921) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 29950741 + ... + 29953261.

It is an arithmetic number, because the mean of its divisors is an integer number (8470926037).

Almost surely, 2^75508994521 is an apocalyptic number.

75508994521 is the 274789-th square number.

75508994521 is the 137395-th centered octagonal number.

It is an amenable number.

75508994521 is a deficient number, since it is larger than the sum of its proper divisors (729339812).

75508994521 is an frugal number, since it uses more digits than its factorization.

75508994521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5260 (or 2630 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 55.

The spelling of 75508994521 in words is "seventy-five billion, five hundred eight million, nine hundred ninety-four thousand, five hundred twenty-one".