2631668687 has 4 divisors (see below), whose sum is σ = 2643160920. Its totient is φ = 2620176456.

The previous prime is 2631668653. The next prime is 2631668723. The reversal of 2631668687 is 7868661362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7868661362 = 2 ⋅3934330681.

It is a cyclic number.

It is not a de Polignac number, because 2631668687 - 2²² = 2627474383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2631668087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5745773 + ... + 5746230.

It is an arithmetic number, because the mean of its divisors is an integer number (660790230).

Almost surely, 2^2631668687 is an apocalyptic number.

2631668687 is a deficient number, since it is larger than the sum of its proper divisors (11492233).

2631668687 is a wasteful number, since it uses less digits than its factorization.

2631668687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11492232.

The product of its digits is 3483648, while the sum is 53.

The square root of 2631668687 is about 51299.7922705346. The cubic root of 2631668687 is about 1380.6292528670.

The spelling of 2631668687 in words is "two billion, six hundred thirty-one million, six hundred sixty-eight thousand, six hundred eighty-seven".