2664969991 has 4 divisors (see below), whose sum is σ = 2678362000. Its totient is φ = 2651577984.

The previous prime is 2664969977. The next prime is 2664970037. The reversal of 2664969991 is 1999694662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2664969991 - 2²⁹ = 2128099079 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 (2664969191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6695706 + ... + 6696103.

It is an arithmetic number, because the mean of its divisors is an integer number (669590500).

Almost surely, 2^2664969991 is an apocalyptic number.

2664969991 is a deficient number, since it is larger than the sum of its proper divisors (13392009).

2664969991 is a wasteful number, since it uses less digits than its factorization.

2664969991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13392008.

The product of its digits is 11337408, while the sum is 61.

The square root of 2664969991 is about 51623.3473440071. The cubic root of 2664969991 is about 1386.4283840041.

The spelling of 2664969991 in words is "two billion, six hundred sixty-four million, nine hundred sixty-nine thousand, nine hundred ninety-one".