2507861806681 has 16 divisors (see below), whose sum is σ = 3126824714880. Its totient is φ = 1954090615680.

The previous prime is 2507861806663. The next prime is 2507861806691. The reversal of 2507861806681 is 1866081687052.

2507861806681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2507861806681 - 2¹¹ = 2507861804633 is a prime.

It is a super-2 number, since 2×2507861806681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2507861806691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1031485 + ... + 2465701.

It is an arithmetic number, because the mean of its divisors is an integer number (195426544680).

Almost surely, 2^{2507861806681} is an apocalyptic number.

It is an amenable number.

2507861806681 is a deficient number, since it is larger than the sum of its proper divisors (618962908199).

2507861806681 is a wasteful number, since it uses less digits than its factorization.

2507861806681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456944.

The product of its (nonzero) digits is 7741440, while the sum is 58.

The spelling of 2507861806681 in words is "two trillion, five hundred seven billion, eight hundred sixty-one million, eight hundred six thousand, six hundred eighty-one".