2525552781 has 8 divisors (see below), whose sum is σ = 3398297760. Its totient is φ = 1668254832.

The previous prime is 2525552737. The next prime is 2525552803. The reversal of 2525552781 is 1872555252.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2525552781 - 2⁶ = 2525552717 is a prime.

It is a super-2 number, since 2×2525552781² = 12756833699233667922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2525592781) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3861375 + ... + 3862028.

It is an arithmetic number, because the mean of its divisors is an integer number (424787220).

Almost surely, 2^2525552781 is an apocalyptic number.

It is an amenable number.

2525552781 is a deficient number, since it is larger than the sum of its proper divisors (872744979).

2525552781 is a wasteful number, since it uses less digits than its factorization.

2525552781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7723515.

The product of its digits is 280000, while the sum is 42.

The square root of 2525552781 is about 50254.8781811278. The cubic root of 2525552781 is about 1361.8172040618.

The spelling of 2525552781 in words is "two billion, five hundred twenty-five million, five hundred fifty-two thousand, seven hundred eighty-one".