2520735681 has 16 divisors (see below), whose sum is σ = 3545652800. Its totient is φ = 1588543488.

The previous prime is 2520735677. The next prime is 2520735689. The reversal of 2520735681 is 1865370252.

It is not a de Polignac number, because 2520735681 - 2² = 2520735677 is a prime.

It is a super-2 number, since 2×2520735681² = 12708216746933067522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2520735689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22336 + ... + 74433.

It is an arithmetic number, because the mean of its divisors is an integer number (221603300).

Almost surely, 2^2520735681 is an apocalyptic number.

It is an amenable number.

2520735681 is a deficient number, since it is larger than the sum of its proper divisors (1024917119).

2520735681 is a wasteful number, since it uses less digits than its factorization.

2520735681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97248.

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 2520735681 is about 50206.9286154810. The cubic root of 2520735681 is about 1360.9508346790.

The spelling of 2520735681 in words is "two billion, five hundred twenty million, seven hundred thirty-five thousand, six hundred eighty-one".