78074923897 has 2 divisors, whose sum is σ = 78074923898. Its totient is φ = 78074923896.

The previous prime is 78074923867. The next prime is 78074923903. The reversal of 78074923897 is 79832947087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63432955881 + 14641968016 = 251859^2 + 121004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78074923897 is a prime.

It is not a weakly prime, because it can be changed into another prime (78074923867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39037461948 + 39037461949.

It is an arithmetic number, because the mean of its divisors is an integer number (39037461949).

Almost surely, 2^78074923897 is an apocalyptic number.

It is an amenable number.

78074923897 is a deficient number, since it is larger than the sum of its proper divisors (1).

78074923897 is an equidigital number, since it uses as much as digits as its factorization.

78074923897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42674688, while the sum is 64.

The spelling of 78074923897 in words is "seventy-eight billion, seventy-four million, nine hundred twenty-three thousand, eight hundred ninety-seven".