76721081599 has 4 divisors (see below), whose sum is σ = 77144955160. Its totient is φ = 76297208040.

The previous prime is 76721081561. The next prime is 76721081611. The reversal of 76721081599 is 99518012767.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 76721081599 - 2¹¹ = 76721079551 is a prime.

It is a super-2 number, since 2×76721081599² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76721081699) 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, 211936509 + ... + 211936870.

It is an arithmetic number, because the mean of its divisors is an integer number (19286238790).

Almost surely, 2^76721081599 is an apocalyptic number.

76721081599 is a deficient number, since it is larger than the sum of its proper divisors (423873561).

76721081599 is a wasteful number, since it uses less digits than its factorization.

76721081599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423873560.

The product of its (nonzero) digits is 1905120, while the sum is 55.

The spelling of 76721081599 in words is "seventy-six billion, seven hundred twenty-one million, eighty-one thousand, five hundred ninety-nine".