78590864591 has 2 divisors, whose sum is σ = 78590864592. Its totient is φ = 78590864590.

The previous prime is 78590864587. The next prime is 78590864657. The reversal of 78590864591 is 19546809587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78590864591 - 2² = 78590864587 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78590864501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39295432295 + 39295432296.

It is an arithmetic number, because the mean of its divisors is an integer number (39295432296).

Almost surely, 2^78590864591 is an apocalyptic number.

78590864591 is a deficient number, since it is larger than the sum of its proper divisors (1).

78590864591 is an equidigital number, since it uses as much as digits as its factorization.

78590864591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21772800, while the sum is 62.

The spelling of 78590864591 in words is "seventy-eight billion, five hundred ninety million, eight hundred sixty-four thousand, five hundred ninety-one".