2686697781 has 16 divisors (see below), whose sum is σ = 3750800256. Its totient is φ = 1707396416.

The previous prime is 2686697777. The next prime is 2686697791. The reversal of 2686697781 is 1877966862.

It is a cyclic number.

It is not a de Polignac number, because 2686697781 - 2² = 2686697777 is a prime.

It is a super-2 number, since 2×2686697781² = 14436689932860647922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2686697701) 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, 46230 + ... + 86663.

It is an arithmetic number, because the mean of its divisors is an integer number (234425016).

Almost surely, 2^2686697781 is an apocalyptic number.

It is an amenable number.

2686697781 is a deficient number, since it is larger than the sum of its proper divisors (1064102475).

2686697781 is a wasteful number, since it uses less digits than its factorization.

2686697781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133212.

The product of its digits is 12192768, while the sum is 60.

The square root of 2686697781 is about 51833.3655187467. The cubic root of 2686697781 is about 1390.1860905384.

The spelling of 2686697781 in words is "two billion, six hundred eighty-six million, six hundred ninety-seven thousand, seven hundred eighty-one".