75740861021 has 4 divisors (see below), whose sum is σ = 86560984032. Its totient is φ = 64920738012.

The previous prime is 75740861003. The next prime is 75740861023. The reversal of 75740861021 is 12016804757.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 75740861021 - 2²² = 75736666717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75740861021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75740861023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5410061495 + ... + 5410061508.

It is an arithmetic number, because the mean of its divisors is an integer number (21640246008).

Almost surely, 2^75740861021 is an apocalyptic number.

It is an amenable number.

75740861021 is a deficient number, since it is larger than the sum of its proper divisors (10820123011).

75740861021 is a wasteful number, since it uses less digits than its factorization.

75740861021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10820123010.

The product of its (nonzero) digits is 94080, while the sum is 41.

The spelling of 75740861021 in words is "seventy-five billion, seven hundred forty million, eight hundred sixty-one thousand, twenty-one".