2551265920 has 64 divisors (see below), whose sum is σ = 6970435200. Its totient is φ = 874718208.

The previous prime is 2551265867. The next prime is 2551265971. The reversal of 2551265920 is 295621552.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 2551265920.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280260 + ... + 289219.

It is an arithmetic number, because the mean of its divisors is an integer number (108913050).

Almost surely, 2^2551265920 is an apocalyptic number.

2551265920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2551265920 is an abundant number, since it is smaller than the sum of its proper divisors (4419169280).

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

2551265920 is an equidigital number, since it uses as much as digits as its factorization.

2551265920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569505 (or 569493 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 37.

The square root of 2551265920 is about 50510.0576123211. The cubic root of 2551265920 is about 1366.4232486030.

The spelling of 2551265920 in words is "two billion, five hundred fifty-one million, two hundred sixty-five thousand, nine hundred twenty".