75801891991 has 16 divisors (see below), whose sum is σ = 91742595840. Its totient is φ = 61140481920.

The previous prime is 75801891989. The next prime is 75801892021. The reversal of 75801891991 is 19919810857.

It is not a de Polignac number, because 75801891991 - 2¹ = 75801891989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75801891091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 672540 + ... + 777118.

It is an arithmetic number, because the mean of its divisors is an integer number (5733912240).

Almost surely, 2^75801891991 is an apocalyptic number.

75801891991 is a deficient number, since it is larger than the sum of its proper divisors (15940703849).

75801891991 is a wasteful number, since it uses less digits than its factorization.

75801891991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110694.

The product of its (nonzero) digits is 1632960, while the sum is 58.

The spelling of 75801891991 in words is "seventy-five billion, eight hundred one million, eight hundred ninety-one thousand, nine hundred ninety-one".