77664157 has 2 divisors, whose sum is σ = 77664158. Its totient is φ = 77664156.

The previous prime is 77664151. The next prime is 77664187. The reversal of 77664157 is 75146677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67716441 + 9947716 = 8229^2 + 3154^2 .

It is an emirp because it is prime and its reverse (75146677) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77664157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77664151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38832078 + 38832079.

It is an arithmetic number, because the mean of its divisors is an integer number (38832079).

Almost surely, 2^77664157 is an apocalyptic number.

It is an amenable number.

77664157 is a deficient number, since it is larger than the sum of its proper divisors (1).

77664157 is an equidigital number, since it uses as much as digits as its factorization.

77664157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 246960, while the sum is 43.

The square root of 77664157 is about 8812.7269899844. The cubic root of 77664157 is about 426.6517626494.

The spelling of 77664157 in words is "seventy-seven million, six hundred sixty-four thousand, one hundred fifty-seven".