76691719509 has 4 divisors (see below), whose sum is σ = 102255626016. Its totient is φ = 51127813004.

The previous prime is 76691719493. The next prime is 76691719553. The reversal of 76691719509 is 90591719667.

It is a happy number.

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: 90591719667 = 3 ⋅30197239889.

It is a cyclic number.

It is not a de Polignac number, because 76691719509 - 2⁴ = 76691719493 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76691709509) 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, 12781953249 + ... + 12781953254.

It is an arithmetic number, because the mean of its divisors is an integer number (25563906504).

Almost surely, 2^76691719509 is an apocalyptic number.

It is an amenable number.

76691719509 is a deficient number, since it is larger than the sum of its proper divisors (25563906507).

76691719509 is a wasteful number, since it uses less digits than its factorization.

76691719509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25563906506.

The product of its (nonzero) digits is 6429780, while the sum is 60.

The spelling of 76691719509 in words is "seventy-six billion, six hundred ninety-one million, seven hundred nineteen thousand, five hundred nine".