74991069991 has 2 divisors, whose sum is σ = 74991069992. Its totient is φ = 74991069990.

The previous prime is 74991069949. The next prime is 74991070003. The reversal of 74991069991 is 19996019947.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74991069991 - 2⁷ = 74991069863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74991069911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37495534995 + 37495534996.

It is an arithmetic number, because the mean of its divisors is an integer number (37495534996).

Almost surely, 2^74991069991 is an apocalyptic number.

74991069991 is a deficient number, since it is larger than the sum of its proper divisors (1).

74991069991 is an equidigital number, since it uses as much as digits as its factorization.

74991069991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9920232, while the sum is 64.

The spelling of 74991069991 in words is "seventy-four billion, nine hundred ninety-one million, sixty-nine thousand, nine hundred ninety-one".