20597977999 has 2 divisors, whose sum is σ = 20597978000. Its totient is φ = 20597977998.

The previous prime is 20597977979. The next prime is 20597978017. The reversal of 20597977999 is 99977979502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20597977999 - 2¹⁵ = 20597945231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20597977979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10298988999 + 10298989000.

It is an arithmetic number, because the mean of its divisors is an integer number (10298989000).

Almost surely, 2^20597977999 is an apocalyptic number.

20597977999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20597977999 is an equidigital number, since it uses as much as digits as its factorization.

20597977999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 202538070, while the sum is 73.

The spelling of 20597977999 in words is "twenty billion, five hundred ninety-seven million, nine hundred seventy-seven thousand, nine hundred ninety-nine".