2691640997 has 8 divisors (see below), whose sum is σ = 2706359040. Its totient is φ = 2676947040.

The previous prime is 2691640993. The next prime is 2691641041. The reversal of 2691640997 is 7990461962.

2691640997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2691640997 - 2² = 2691640993 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 (2691640993) 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, 246422 + ... + 257112.

It is an arithmetic number, because the mean of its divisors is an integer number (338294880).

Almost surely, 2^2691640997 is an apocalyptic number.

It is an amenable number.

2691640997 is a deficient number, since it is larger than the sum of its proper divisors (14718043).

2691640997 is a wasteful number, since it uses less digits than its factorization.

2691640997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12043.

The product of its (nonzero) digits is 1469664, while the sum is 53.

The square root of 2691640997 is about 51881.0273317713. The cubic root of 2691640997 is about 1391.0381625403.

The spelling of 2691640997 in words is "two billion, six hundred ninety-one million, six hundred forty thousand, nine hundred ninety-seven".