25015421455 has 4 divisors (see below), whose sum is σ = 30018505752. Its totient is φ = 20012337160.

The previous prime is 25015421447. The next prime is 25015421491. The reversal of 25015421455 is 55412451052.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25015421455 - 2³ = 25015421447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25015421455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2501542141 + ... + 2501542150.

It is an arithmetic number, because the mean of its divisors is an integer number (7504626438).

Almost surely, 2^25015421455 is an apocalyptic number.

25015421455 is a deficient number, since it is larger than the sum of its proper divisors (5003084297).

25015421455 is an equidigital number, since it uses as much as digits as its factorization.

25015421455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5003084296.

The product of its (nonzero) digits is 40000, while the sum is 34.

The spelling of 25015421455 in words is "twenty-five billion, fifteen million, four hundred twenty-one thousand, four hundred fifty-five".