2495739681 has 20 divisors (see below), whose sum is σ = 3856766100. Its totient is φ = 1606451616.

The previous prime is 2495739679. The next prime is 2495739713. The reversal of 2495739681 is 1869375942.

2495739681 is a `hidden beast` number, since 2 + 4 + 9 + 573 + 9 + 68 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1551099456 + 944640225 = 39384^2 + 30735^2 .

It is not a de Polignac number, because 2495739681 - 2¹ = 2495739679 is a prime.

It is a super-2 number, since 2×2495739681² = 12457433110635963522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2495739601) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 528886 + ... + 533583.

It is an arithmetic number, because the mean of its divisors is an integer number (192838305).

Almost surely, 2^2495739681 is an apocalyptic number.

It is an amenable number.

2495739681 is a deficient number, since it is larger than the sum of its proper divisors (1361026419).

2495739681 is a wasteful number, since it uses less digits than its factorization.

2495739681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062510 (or 1062501 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 2495739681 is about 49957.3786442003. The cubic root of 2495739681 is about 1356.4374176189.

The spelling of 2495739681 in words is "two billion, four hundred ninety-five million, seven hundred thirty-nine thousand, six hundred eighty-one".