20164257697 has 2 divisors, whose sum is σ = 20164257698. Its totient is φ = 20164257696.

The previous prime is 20164257691. The next prime is 20164257793. The reversal of 20164257697 is 79675246102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20163716001 + 541696 = 141999^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 20164257697 - 2³ = 20164257689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20164257697.

It is not a weakly prime, because it can be changed into another prime (20164257691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082128848 + 10082128849.

It is an arithmetic number, because the mean of its divisors is an integer number (10082128849).

Almost surely, 2^20164257697 is an apocalyptic number.

It is an amenable number.

20164257697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20164257697 is an equidigital number, since it uses as much as digits as its factorization.

20164257697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 20164257697 in words is "twenty billion, one hundred sixty-four million, two hundred fifty-seven thousand, six hundred ninety-seven".