77616541 has 2 divisors, whose sum is σ = 77616542. Its totient is φ = 77616540.

The previous prime is 77616533. The next prime is 77616563. The reversal of 77616541 is 14561677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77616100 + 441 = 8810^2 + 21^2 .

It is a cyclic number.

It is not a de Polignac number, because 77616541 - 2³ = 77616533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77616541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77616571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38808270 + 38808271.

It is an arithmetic number, because the mean of its divisors is an integer number (38808271).

Almost surely, 2^77616541 is an apocalyptic number.

It is an amenable number.

77616541 is a deficient number, since it is larger than the sum of its proper divisors (1).

77616541 is an equidigital number, since it uses as much as digits as its factorization.

77616541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 37.

The square root of 77616541 is about 8810.0250283413. The cubic root of 77616541 is about 426.5645512324.

The spelling of 77616541 in words is "seventy-seven million, six hundred sixteen thousand, five hundred forty-one".