25266537380 has 36 divisors (see below), whose sum is σ = 61722543708. Its totient is φ = 8662812480.

The previous prime is 25266537367. The next prime is 25266537397. The reversal of 25266537380 is 8373566252.

It can be written as a sum of positive squares in 2 ways, for example, as 5240891236 + 20025646144 = 72394^2 + 141512^2 .

It is a super-2 number, since 2×25266537380² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12890111 + ... + 12892070.

It is an arithmetic number, because the mean of its divisors is an integer number (1714515103).

Almost surely, 2^25266537380 is an apocalyptic number.

25266537380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25266537380 is an abundant number, since it is smaller than the sum of its proper divisors (36456006328).

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

25266537380 is a wasteful number, since it uses less digits than its factorization.

25266537380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25782204 (or 25782195 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 47.

The spelling of 25266537380 in words is "twenty-five billion, two hundred sixty-six million, five hundred thirty-seven thousand, three hundred eighty".