20145510974191 has 2 divisors, whose sum is σ = 20145510974192. Its totient is φ = 20145510974190.

The previous prime is 20145510974167. The next prime is 20145510974207. The reversal of 20145510974191 is 19147901554102.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20145510974191 - 2¹¹ = 20145510972143 is a prime.

It is a super-2 number, since 2×20145510974191² (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 (20145511974191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10072755487095 + 10072755487096.

It is an arithmetic number, because the mean of its divisors is an integer number (10072755487096).

Almost surely, 2^{20145510974191} is an apocalyptic number.

20145510974191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20145510974191 is an equidigital number, since it uses as much as digits as its factorization.

20145510974191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 453600, while the sum is 49.

The spelling of 20145510974191 in words is "twenty trillion, one hundred forty-five billion, five hundred ten million, nine hundred seventy-four thousand, one hundred ninety-one".