75319503921 has 12 divisors (see below), whose sum is σ = 109358545348. Its totient is φ = 49952830464.

The previous prime is 75319503913. The next prime is 75319503991. The reversal of 75319503921 is 12930591357.

75319503921 is a `hidden beast` number, since 7 + 53 + 1 + 9 + 503 + 92 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21597535521 + 53721968400 = 146961^2 + 231780^2 .

It is not a de Polignac number, because 75319503921 - 2³ = 75319503913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75319503991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21679180 + ... + 21682653.

Almost surely, 2^75319503921 is an apocalyptic number.

It is an amenable number.

75319503921 is a deficient number, since it is larger than the sum of its proper divisors (34039041427).

75319503921 is a wasteful number, since it uses less digits than its factorization.

75319503921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43362032 (or 43362029 counting only the distinct ones).

The product of its (nonzero) digits is 255150, while the sum is 45.

The spelling of 75319503921 in words is "seventy-five billion, three hundred nineteen million, five hundred three thousand, nine hundred twenty-one".