25551511240 has 32 divisors (see below), whose sum is σ = 58300637760. Its totient is φ = 10076651200.

The previous prime is 25551511189. The next prime is 25551511243. The reversal of 25551511240 is 4211515552.

It is not an unprimeable number, because it can be changed into a prime (25551511243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4495666 + ... + 4501345.

It is an arithmetic number, because the mean of its divisors is an integer number (1821894930).

Almost surely, 2^25551511240 is an apocalyptic number.

25551511240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25551511240 is an abundant number, since it is smaller than the sum of its proper divisors (32749126520).

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

25551511240 is a wasteful number, since it uses less digits than its factorization.

25551511240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8997093 (or 8997089 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 31.

The spelling of 25551511240 in words is "twenty-five billion, five hundred fifty-one million, five hundred eleven thousand, two hundred forty".