75990831821 has 8 divisors (see below), whose sum is σ = 77818069824. Its totient is φ = 74166321600.

The previous prime is 75990831779. The next prime is 75990831869. The reversal of 75990831821 is 12813809957.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75990831821 - 2²⁶ = 75923722957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75990831121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625505 + ... + 737046.

It is an arithmetic number, because the mean of its divisors is an integer number (9727258728).

Almost surely, 2^75990831821 is an apocalyptic number.

It is an amenable number.

75990831821 is a deficient number, since it is larger than the sum of its proper divisors (1827238003).

75990831821 is a wasteful number, since it uses less digits than its factorization.

75990831821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363891.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The spelling of 75990831821 in words is "seventy-five billion, nine hundred ninety million, eight hundred thirty-one thousand, eight hundred twenty-one".