2690645691 has 8 divisors (see below), whose sum is σ = 3596994880. Its totient is φ = 1789030152.

The previous prime is 2690645677. The next prime is 2690645729. The reversal of 2690645691 is 1965460962.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2690645691 - 2¹⁵ = 2690612923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2690645691.

It is not an unprimeable number, because it can be changed into a prime (2690646691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1182085 + ... + 1184358.

It is an arithmetic number, because the mean of its divisors is an integer number (449624360).

Almost surely, 2^2690645691 is an apocalyptic number.

2690645691 is a deficient number, since it is larger than the sum of its proper divisors (906349189).

2690645691 is a wasteful number, since it uses less digits than its factorization.

2690645691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366825.

The product of its (nonzero) digits is 699840, while the sum is 48.

The square root of 2690645691 is about 51871.4342485341. The cubic root of 2690645691 is about 1390.8666835901.

The spelling of 2690645691 in words is "two billion, six hundred ninety million, six hundred forty-five thousand, six hundred ninety-one".