25220515451 has 2 divisors, whose sum is σ = 25220515452. Its totient is φ = 25220515450.

The previous prime is 25220515429. The next prime is 25220515477. The reversal of 25220515451 is 15451502252.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25220515451 - 2²⁶ = 25153406587 is a prime.

It is a super-2 number, since 2×25220515451² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25220515951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12610257725 + 12610257726.

It is an arithmetic number, because the mean of its divisors is an integer number (12610257726).

Almost surely, 2^25220515451 is an apocalyptic number.

25220515451 is a deficient number, since it is larger than the sum of its proper divisors (1).

25220515451 is an equidigital number, since it uses as much as digits as its factorization.

25220515451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20000, while the sum is 32.

The spelling of 25220515451 in words is "twenty-five billion, two hundred twenty million, five hundred fifteen thousand, four hundred fifty-one".