20556153719 has 2 divisors, whose sum is σ = 20556153720. Its totient is φ = 20556153718.

The previous prime is 20556153707. The next prime is 20556153727. The reversal of 20556153719 is 91735165502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20556153719 - 2⁴ = 20556153703 is a prime.

It is a super-2 number, since 2×20556153719² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20556153719.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20556153769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10278076859 + 10278076860.

It is an arithmetic number, because the mean of its divisors is an integer number (10278076860).

Almost surely, 2^20556153719 is an apocalyptic number.

20556153719 is a deficient number, since it is larger than the sum of its proper divisors (1).

20556153719 is an equidigital number, since it uses as much as digits as its factorization.

20556153719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 283500, while the sum is 44.

The spelling of 20556153719 in words is "twenty billion, five hundred fifty-six million, one hundred fifty-three thousand, seven hundred nineteen".