25542256506 has 32 divisors (see below), whose sum is σ = 56355905088. Its totient is φ = 7667468160.

The previous prime is 25542256501. The next prime is 25542256507. The reversal of 25542256506 is 60565224552.

It is not an unprimeable number, because it can be changed into a prime (25542256501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3990276 + ... + 3996671.

It is an arithmetic number, because the mean of its divisors is an integer number (1761122034).

Almost surely, 2^25542256506 is an apocalyptic number.

25542256506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

25542256506 is an abundant number, since it is smaller than the sum of its proper divisors (30813648582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25542256506 is a wasteful number, since it uses less digits than its factorization.

25542256506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7987006.

The product of its (nonzero) digits is 720000, while the sum is 42.

The spelling of 25542256506 in words is "twenty-five billion, five hundred forty-two million, two hundred fifty-six thousand, five hundred six".