2551610781 has 16 divisors (see below), whose sum is σ = 3836587200. Its totient is φ = 1675683504.

The previous prime is 2551610749. The next prime is 2551610797. The reversal of 2551610781 is 1870161552.

It is not a de Polignac number, because 2551610781 - 2⁵ = 2551610749 is a prime.

It is a super-2 number, since 2×2551610781² = 13021435155430859922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551610381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 703446 + ... + 707063.

It is an arithmetic number, because the mean of its divisors is an integer number (239786700).

Almost surely, 2^2551610781 is an apocalyptic number.

It is an amenable number.

2551610781 is a deficient number, since it is larger than the sum of its proper divisors (1284976419).

2551610781 is a wasteful number, since it uses less digits than its factorization.

2551610781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410585 (or 1410579 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

The square root of 2551610781 is about 50513.4712824213. The cubic root of 2551610781 is about 1366.4848134460.

The spelling of 2551610781 in words is "two billion, five hundred fifty-one million, six hundred ten thousand, seven hundred eighty-one".