74691640511 has 2 divisors, whose sum is σ = 74691640512. Its totient is φ = 74691640510.

The previous prime is 74691640477. The next prime is 74691640537. The reversal of 74691640511 is 11504619647.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74691640511 - 2¹⁰ = 74691639487 is a prime.

It is a super-2 number, since 2×74691640511² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74691640711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37345820255 + 37345820256.

It is an arithmetic number, because the mean of its divisors is an integer number (37345820256).

Almost surely, 2^74691640511 is an apocalyptic number.

74691640511 is a deficient number, since it is larger than the sum of its proper divisors (1).

74691640511 is an equidigital number, since it uses as much as digits as its factorization.

74691640511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 74691640511 in words is "seventy-four billion, six hundred ninety-one million, six hundred forty thousand, five hundred eleven".