25567220091 has 64 divisors (see below), whose sum is σ = 42728878080. Its totient is φ = 13259151360.

The previous prime is 25567220083. The next prime is 25567220101. The reversal of 25567220091 is 19002276552.

It is not a de Polignac number, because 25567220091 - 2³ = 25567220083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25567222091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13737501 + ... + 13739361.

It is an arithmetic number, because the mean of its divisors is an integer number (667638720).

Almost surely, 2^25567220091 is an apocalyptic number.

25567220091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

25567220091 is a deficient number, since it is larger than the sum of its proper divisors (17161657989).

25567220091 is a wasteful number, since it uses less digits than its factorization.

25567220091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3244.

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 25567220091 in words is "twenty-five billion, five hundred sixty-seven million, two hundred twenty thousand, ninety-one".