74696249521 has 2 divisors, whose sum is σ = 74696249522. Its totient is φ = 74696249520.

The previous prime is 74696249503. The next prime is 74696249531. The reversal of 74696249521 is 12594269647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45994807296 + 28701442225 = 214464^2 + 169415^2 .

It is a cyclic number.

It is not a de Polignac number, because 74696249521 - 2²⁷ = 74562031793 is a prime.

It is not a weakly prime, because it can be changed into another prime (74696249531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37348124760 + 37348124761.

It is an arithmetic number, because the mean of its divisors is an integer number (37348124761).

Almost surely, 2^74696249521 is an apocalyptic number.

It is an amenable number.

74696249521 is a deficient number, since it is larger than the sum of its proper divisors (1).

74696249521 is an equidigital number, since it uses as much as digits as its factorization.

74696249521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 55.

The spelling of 74696249521 in words is "seventy-four billion, six hundred ninety-six million, two hundred forty-nine thousand, five hundred twenty-one".