68920999997 has 2 divisors, whose sum is σ = 68920999998. Its totient is φ = 68920999996.

The previous prime is 68920999967. The next prime is 68921000009. The reversal of 68920999997 is 79999902986.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58342054681 + 10578945316 = 241541^2 + 102854^2 .

It is a cyclic number.

It is not a de Polignac number, because 68920999997 - 2⁶ = 68920999933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68920999937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34460499998 + 34460499999.

It is an arithmetic number, because the mean of its divisors is an integer number (34460499999).

Almost surely, 2^68920999997 is an apocalyptic number.

It is an amenable number.

68920999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

68920999997 is an equidigital number, since it uses as much as digits as its factorization.

68920999997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 357128352, while the sum is 77.

It can be divided in two parts, 6892099 and 9997, that added together give a palindrome (6902096).

The spelling of 68920999997 in words is "sixty-eight billion, nine hundred twenty million, nine hundred ninety-nine thousand, nine hundred ninety-seven".