76449821761 has 4 divisors (see below), whose sum is σ = 76458318592. Its totient is φ = 76441324932.

The previous prime is 76449821753. The next prime is 76449821849. The reversal of 76449821761 is 16712894467.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16712894467 = 347 ⋅48163961.

It is a cyclic number.

It is not a de Polignac number, because 76449821761 - 2³ = 76449821753 is a prime.

It is a super-2 number, since 2×76449821761² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76449821731) 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, 4234905 + ... + 4252918.

It is an arithmetic number, because the mean of its divisors is an integer number (19114579648).

Almost surely, 2^76449821761 is an apocalyptic number.

It is an amenable number.

76449821761 is a deficient number, since it is larger than the sum of its proper divisors (8496831).

76449821761 is an equidigital number, since it uses as much as digits as its factorization.

76449821761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8496830.

The product of its digits is 4064256, while the sum is 55.

The spelling of 76449821761 in words is "seventy-six billion, four hundred forty-nine million, eight hundred twenty-one thousand, seven hundred sixty-one".