77919798689 has 8 divisors (see below), whose sum is σ = 79209275520. Its totient is φ = 76630712400.

The previous prime is 77919798643. The next prime is 77919798701. The reversal of 77919798689 is 98689791977.

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 77919798689 - 2³² = 73624831393 is a prime.

It is a super-2 number, since 2×77919798689² (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 (77919798289) 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, 319304 + ... + 507734.

It is an arithmetic number, because the mean of its divisors is an integer number (9901159440).

Almost surely, 2^77919798689 is an apocalyptic number.

It is an amenable number.

77919798689 is a deficient number, since it is larger than the sum of its proper divisors (1289476831).

77919798689 is a wasteful number, since it uses less digits than its factorization.

77919798689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195271.

The product of its digits is 864162432, while the sum is 80.

The spelling of 77919798689 in words is "seventy-seven billion, nine hundred nineteen million, seven hundred ninety-eight thousand, six hundred eighty-nine".