2553156781 has 32 divisors (see below), whose sum is σ = 3203988480. Its totient is φ = 1983744000.

The previous prime is 2553156731. The next prime is 2553156799. The reversal of 2553156781 is 1876513552.

It is a happy number.

It is not a de Polignac number, because 2553156781 - 2¹⁹ = 2552632493 is a prime.

It is a super-2 number, since 2×2553156781² = 13037219096732563922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2553156721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2073436 + ... + 2074666.

It is an arithmetic number, because the mean of its divisors is an integer number (100124640).

Almost surely, 2^2553156781 is an apocalyptic number.

It is an amenable number.

2553156781 is a deficient number, since it is larger than the sum of its proper divisors (650831699).

2553156781 is a wasteful number, since it uses less digits than its factorization.

2553156781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885.

The product of its digits is 252000, while the sum is 43.

The square root of 2553156781 is about 50528.7718136905. The cubic root of 2553156781 is about 1366.7607383657.

The spelling of 2553156781 in words is "two billion, five hundred fifty-three million, one hundred fifty-six thousand, seven hundred eighty-one".