25121505667 has 2 divisors, whose sum is σ = 25121505668. Its totient is φ = 25121505666.

The previous prime is 25121505583. The next prime is 25121505683. The reversal of 25121505667 is 76650512152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25121505667 - 2²³ = 25113117059 is a prime.

It is a super-2 number, since 2×25121505667² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25121505467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12560752833 + 12560752834.

It is an arithmetic number, because the mean of its divisors is an integer number (12560752834).

Almost surely, 2^25121505667 is an apocalyptic number.

25121505667 is a deficient number, since it is larger than the sum of its proper divisors (1).

25121505667 is an equidigital number, since it uses as much as digits as its factorization.

25121505667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 40.

The spelling of 25121505667 in words is "twenty-five billion, one hundred twenty-one million, five hundred five thousand, six hundred sixty-seven".