74365978657 has 2 divisors, whose sum is σ = 74365978658. Its totient is φ = 74365978656.

The previous prime is 74365978633. The next prime is 74365978717. The reversal of 74365978657 is 75687956347.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71657400721 + 2708577936 = 267689^2 + 52044^2 .

It is a cyclic number.

It is not a de Polignac number, because 74365978657 - 2⁷ = 74365978529 is a prime.

It is a super-2 number, since 2×74365978657² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 74365978592 and 74365978601.

It is not a weakly prime, because it can be changed into another prime (74365975657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37182989328 + 37182989329.

It is an arithmetic number, because the mean of its divisors is an integer number (37182989329).

Almost surely, 2^74365978657 is an apocalyptic number.

It is an amenable number.

74365978657 is a deficient number, since it is larger than the sum of its proper divisors (1).

74365978657 is an equidigital number, since it uses as much as digits as its factorization.

74365978657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 266716800, while the sum is 67.

The spelling of 74365978657 in words is "seventy-four billion, three hundred sixty-five million, nine hundred seventy-eight thousand, six hundred fifty-seven".