75508994921 has 2 divisors, whose sum is σ = 75508994922. Its totient is φ = 75508994920.

The previous prime is 75508994909. The next prime is 75508994927. The reversal of 75508994921 is 12949980557.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75508994521 + 400 = 274789^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 75508994921 - 2⁶ = 75508994857 is a prime.

It is not a weakly prime, because it can be changed into another prime (75508994927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37754497460 + 37754497461.

It is an arithmetic number, because the mean of its divisors is an integer number (37754497461).

Almost surely, 2^75508994921 is an apocalyptic number.

It is an amenable number.

75508994921 is a deficient number, since it is larger than the sum of its proper divisors (1).

75508994921 is an equidigital number, since it uses as much as digits as its factorization.

75508994921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8164800, while the sum is 59.

The spelling of 75508994921 in words is "seventy-five billion, five hundred eight million, nine hundred ninety-four thousand, nine hundred twenty-one".