74490400661 has 2 divisors, whose sum is σ = 74490400662. Its totient is φ = 74490400660.

The previous prime is 74490400651. The next prime is 74490400667. The reversal of 74490400661 is 16600409447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53768798161 + 20721602500 = 231881^2 + 143950^2 .

It is a cyclic number.

It is not a de Polignac number, because 74490400661 - 2¹⁰ = 74490399637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74490400667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37245200330 + 37245200331.

It is an arithmetic number, because the mean of its divisors is an integer number (37245200331).

Almost surely, 2^74490400661 is an apocalyptic number.

It is an amenable number.

74490400661 is a deficient number, since it is larger than the sum of its proper divisors (1).

74490400661 is an equidigital number, since it uses as much as digits as its factorization.

74490400661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 74490400661 in words is "seventy-four billion, four hundred ninety million, four hundred thousand, six hundred sixty-one".