2552507781 has 8 divisors (see below), whose sum is σ = 3408844320. Its totient is φ = 1698921552.

The previous prime is 2552507779. The next prime is 2552507803. The reversal of 2552507781 is 1877052552.

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

It is not a de Polignac number, because 2552507781 - 2¹ = 2552507779 is a prime.

It is a super-2 number, since 2×2552507781² = 13030591944131087922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2552507281) 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, 685410 + ... + 689123.

It is an arithmetic number, because the mean of its divisors is an integer number (426105540).

Almost surely, 2^2552507781 is an apocalyptic number.

It is an amenable number.

2552507781 is a deficient number, since it is larger than the sum of its proper divisors (856336539).

2552507781 is a wasteful number, since it uses less digits than its factorization.

2552507781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375155.

The product of its (nonzero) digits is 196000, while the sum is 42.

The square root of 2552507781 is about 50522.3493218595. The cubic root of 2552507781 is about 1366.6449205807.

The spelling of 2552507781 in words is "two billion, five hundred fifty-two million, five hundred seven thousand, seven hundred eighty-one".