25542421940 has 48 divisors (see below), whose sum is σ = 61343702784. Its totient is φ = 8751417600.

The previous prime is 25542421913. The next prime is 25542421951. The reversal of 25542421940 is 4912424552.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 25542421894 and 25542421903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145745 + ... + 268935.

It is an arithmetic number, because the mean of its divisors is an integer number (1277993808).

Almost surely, 2^25542421940 is an apocalyptic number.

25542421940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25542421940 is an abundant number, since it is smaller than the sum of its proper divisors (35801280844).

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

25542421940 is a wasteful number, since it uses less digits than its factorization.

25542421940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124688 (or 124686 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 25542421940 in words is "twenty-five billion, five hundred forty-two million, four hundred twenty-one thousand, nine hundred forty".