25985221151 has 4 divisors (see below), whose sum is σ = 26008485672. Its totient is φ = 25961956632.

The previous prime is 25985221147. The next prime is 25985221159. The reversal of 25985221151 is 15112258952.

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

It is a cyclic number.

It is not a de Polignac number, because 25985221151 - 2² = 25985221147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25985221099 and 25985221108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25985221159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11630585 + ... + 11632818.

It is an arithmetic number, because the mean of its divisors is an integer number (6502121418).

Almost surely, 2^25985221151 is an apocalyptic number.

25985221151 is a deficient number, since it is larger than the sum of its proper divisors (23264521).

25985221151 is a wasteful number, since it uses less digits than its factorization.

25985221151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23264520.

The product of its digits is 72000, while the sum is 41.

The spelling of 25985221151 in words is "twenty-five billion, nine hundred eighty-five million, two hundred twenty-one thousand, one hundred fifty-one".