20400515225663 has 2 divisors, whose sum is σ = 20400515225664. Its totient is φ = 20400515225662.

The previous prime is 20400515225621. The next prime is 20400515225669. The reversal of 20400515225663 is 36652251500402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20400515225663 - 2¹⁴ = 20400515209279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20400515225663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20400515225669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200257612831 + 10200257612832.

It is an arithmetic number, because the mean of its divisors is an integer number (10200257612832).

Almost surely, 2^{20400515225663} is an apocalyptic number.

20400515225663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400515225663 is an equidigital number, since it uses as much as digits as its factorization.

20400515225663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 20400515225663 in words is "twenty trillion, four hundred billion, five hundred fifteen million, two hundred twenty-five thousand, six hundred sixty-three".