74991069949 has 2 divisors, whose sum is σ = 74991069950. Its totient is φ = 74991069948.

The previous prime is 74991069943. The next prime is 74991069991. The reversal of 74991069949 is 94996019947.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71099556025 + 3891513924 = 266645^2 + 62382^2 .

It is a cyclic number.

It is not a de Polignac number, because 74991069949 - 2¹¹ = 74991067901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74991069943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37495534974 + 37495534975.

It is an arithmetic number, because the mean of its divisors is an integer number (37495534975).

Almost surely, 2^74991069949 is an apocalyptic number.

It is an amenable number.

74991069949 is a deficient number, since it is larger than the sum of its proper divisors (1).

74991069949 is an equidigital number, since it uses as much as digits as its factorization.

74991069949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39680928, while the sum is 67.

The spelling of 74991069949 in words is "seventy-four billion, nine hundred ninety-one million, sixty-nine thousand, nine hundred forty-nine".