77670037691 has 2 divisors, whose sum is σ = 77670037692. Its totient is φ = 77670037690.

The previous prime is 77670037673. The next prime is 77670037741. The reversal of 77670037691 is 19673007677.

It is a weak prime.

It is an emirp because it is prime and its reverse (19673007677) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77670037691 is a prime.

It is a super-2 number, since 2×77670037691² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77670037651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38835018845 + 38835018846.

It is an arithmetic number, because the mean of its divisors is an integer number (38835018846).

Almost surely, 2^77670037691 is an apocalyptic number.

77670037691 is a deficient number, since it is larger than the sum of its proper divisors (1).

77670037691 is an equidigital number, since it uses as much as digits as its factorization.

77670037691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2333772, while the sum is 53.

The spelling of 77670037691 in words is "seventy-seven billion, six hundred seventy million, thirty-seven thousand, six hundred ninety-one".