68904493877 has 2 divisors, whose sum is σ = 68904493878. Its totient is φ = 68904493876.

The previous prime is 68904493813. The next prime is 68904493897. The reversal of 68904493877 is 77839440986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36731255716 + 32173238161 = 191654^2 + 179369^2 .

It is a cyclic number.

It is not a de Polignac number, because 68904493877 - 2⁶ = 68904493813 is a prime.

It is a super-2 number, since 2×68904493877² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68904493897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34452246938 + 34452246939.

It is an arithmetic number, because the mean of its divisors is an integer number (34452246939).

Almost surely, 2^68904493877 is an apocalyptic number.

It is an amenable number.

68904493877 is a deficient number, since it is larger than the sum of its proper divisors (1).

68904493877 is an equidigital number, since it uses as much as digits as its factorization.

68904493877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73156608, while the sum is 65.

The spelling of 68904493877 in words is "sixty-eight billion, nine hundred four million, four hundred ninety-three thousand, eight hundred seventy-seven".