25222810665 has 64 divisors (see below), whose sum is σ = 46311422976. Its totient is φ = 11612270592.

The previous prime is 25222810661. The next prime is 25222810667. The reversal of 25222810665 is 56601822252.

It is a happy number.

It is not a de Polignac number, because 25222810665 - 2² = 25222810661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (25222810661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 496224 + ... + 544686.

It is an arithmetic number, because the mean of its divisors is an integer number (723615984).

Almost surely, 2^25222810665 is an apocalyptic number.

It is an amenable number.

25222810665 is a deficient number, since it is larger than the sum of its proper divisors (21088612311).

25222810665 is a wasteful number, since it uses less digits than its factorization.

25222810665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48658.

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 25222810665 in words is "twenty-five billion, two hundred twenty-two million, eight hundred ten thousand, six hundred sixty-five".