78164551177 has 2 divisors, whose sum is σ = 78164551178. Its totient is φ = 78164551176.

The previous prime is 78164551151. The next prime is 78164551183. The reversal of 78164551177 is 77115546187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39631253776 + 38533297401 = 199076^2 + 196299^2 .

It is a cyclic number.

It is not a de Polignac number, because 78164551177 - 2²³ = 78156162569 is a prime.

It is a super-2 number, since 2×78164551177² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78164551477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39082275588 + 39082275589.

It is an arithmetic number, because the mean of its divisors is an integer number (39082275589).

Almost surely, 2^78164551177 is an apocalyptic number.

It is an amenable number.

78164551177 is a deficient number, since it is larger than the sum of its proper divisors (1).

78164551177 is an equidigital number, since it uses as much as digits as its factorization.

78164551177 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1646400, while the sum is 52.

The spelling of 78164551177 in words is "seventy-eight billion, one hundred sixty-four million, five hundred fifty-one thousand, one hundred seventy-seven".