78668045297 has 2 divisors, whose sum is σ = 78668045298. Its totient is φ = 78668045296.

The previous prime is 78668045221. The next prime is 78668045321. The reversal of 78668045297 is 79254086687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76839285601 + 1828759696 = 277199^2 + 42764^2 .

It is a cyclic number.

It is not a de Polignac number, because 78668045297 - 2¹² = 78668041201 is a prime.

It is a super-2 number, since 2×78668045297² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78668048297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39334022648 + 39334022649.

It is an arithmetic number, because the mean of its divisors is an integer number (39334022649).

Almost surely, 2^78668045297 is an apocalyptic number.

It is an amenable number.

78668045297 is a deficient number, since it is larger than the sum of its proper divisors (1).

78668045297 is an equidigital number, since it uses as much as digits as its factorization.

78668045297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40642560, while the sum is 62.

The spelling of 78668045297 in words is "seventy-eight billion, six hundred sixty-eight million, forty-five thousand, two hundred ninety-seven".