20163975251951 has 2 divisors, whose sum is σ = 20163975251952. Its totient is φ = 20163975251950.

The previous prime is 20163975251941. The next prime is 20163975252019. The reversal of 20163975251951 is 15915257936102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20163975251951 is a prime.

It is a super-2 number, since 2×20163975251951² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20163975251911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10081987625975 + 10081987625976.

It is an arithmetic number, because the mean of its divisors is an integer number (10081987625976).

Almost surely, 2^{20163975251951} is an apocalyptic number.

20163975251951 is a deficient number, since it is larger than the sum of its proper divisors (1).

20163975251951 is an equidigital number, since it uses as much as digits as its factorization.

20163975251951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103000, while the sum is 56.

The spelling of 20163975251951 in words is "twenty trillion, one hundred sixty-three billion, nine hundred seventy-five million, two hundred fifty-one thousand, nine hundred fifty-one".