2646786681 has 48 divisors (see below), whose sum is σ = 4798684800. Its totient is φ = 1365672960.

The previous prime is 2646786679. The next prime is 2646786713. The reversal of 2646786681 is 1866876462.

2646786681 is a `hidden beast` number, since 26 + 467 + 86 + 6 + 81 = 666.

2646786681 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2646786681 - 2¹ = 2646786679 is a prime.

It is a super-2 number, since 2×2646786681² = 14010959469437991522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2646786281) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 90441 + ... + 116073.

It is an arithmetic number, because the mean of its divisors is an integer number (99972600).

Almost surely, 2^2646786681 is an apocalyptic number.

2646786681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2646786681 is a deficient number, since it is larger than the sum of its proper divisors (2151898119).

2646786681 is a wasteful number, since it uses less digits than its factorization.

2646786681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25806 (or 25803 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 2646786681 is about 51446.9307247770. The cubic root of 2646786681 is about 1383.2679466973.

The spelling of 2646786681 in words is "two billion, six hundred forty-six million, seven hundred eighty-six thousand, six hundred eighty-one".