75980611991 has 2 divisors, whose sum is σ = 75980611992. Its totient is φ = 75980611990.

The previous prime is 75980611981. The next prime is 75980612003. The reversal of 75980611991 is 19911608957.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 75980611991 - 2³⁴ = 58800742807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75980611921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37990305995 + 37990305996.

It is an arithmetic number, because the mean of its divisors is an integer number (37990305996).

Almost surely, 2^75980611991 is an apocalyptic number.

75980611991 is a deficient number, since it is larger than the sum of its proper divisors (1).

75980611991 is an equidigital number, since it uses as much as digits as its factorization.

75980611991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 56.

The spelling of 75980611991 in words is "seventy-five billion, nine hundred eighty million, six hundred eleven thousand, nine hundred ninety-one".