77645651 has 2 divisors, whose sum is σ = 77645652. Its totient is φ = 77645650.

The previous prime is 77645599. The next prime is 77645683. The reversal of 77645651 is 15654677.

It is a strong prime.

It is an emirp because it is prime and its reverse (15654677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77645651 - 2¹⁴ = 77629267 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 77645599 and 77645608.

It is not a weakly prime, because it can be changed into another prime (77642651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38822825 + 38822826.

It is an arithmetic number, because the mean of its divisors is an integer number (38822826).

Almost surely, 2^77645651 is an apocalyptic number.

77645651 is a deficient number, since it is larger than the sum of its proper divisors (1).

77645651 is an equidigital number, since it uses as much as digits as its factorization.

77645651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 41.

The square root of 77645651 is about 8811.6769686593. The cubic root of 77645651 is about 426.6178720919.

The spelling of 77645651 in words is "seventy-seven million, six hundred forty-five thousand, six hundred fifty-one".