77556497 has 2 divisors, whose sum is σ = 77556498. Its totient is φ = 77556496.

The previous prime is 77556491. The next prime is 77556511. The reversal of 77556497 is 79465577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69239041 + 8317456 = 8321^2 + 2884^2 .

It is an emirp because it is prime and its reverse (79465577) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77556497 is a prime.

It is a super-2 number, since 2×77556497² = 12030020453822018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77556491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38778248 + 38778249.

It is an arithmetic number, because the mean of its divisors is an integer number (38778249).

Almost surely, 2^77556497 is an apocalyptic number.

It is an amenable number.

77556497 is a deficient number, since it is larger than the sum of its proper divisors (1).

77556497 is an equidigital number, since it uses as much as digits as its factorization.

77556497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1852200, while the sum is 50.

The square root of 77556497 is about 8806.6166602163. The cubic root of 77556497 is about 426.4545263629.

The spelling of 77556497 in words is "seventy-seven million, five hundred fifty-six thousand, four hundred ninety-seven".