2969920661 has 4 divisors (see below), whose sum is σ = 2991599052. Its totient is φ = 2948242272.

The previous prime is 2969920651. The next prime is 2969920663. The reversal of 2969920661 is 1660299692.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2284266436 + 685654225 = 47794^2 + 26185^2 .

It is a cyclic number.

It is not a de Polignac number, because 2969920661 - 2¹⁴ = 2969904277 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 (2969920663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10838990 + ... + 10839263.

It is an arithmetic number, because the mean of its divisors is an integer number (747899763).

Almost surely, 2^2969920661 is an apocalyptic number.

It is an amenable number.

2969920661 is a deficient number, since it is larger than the sum of its proper divisors (21678391).

2969920661 is a wasteful number, since it uses less digits than its factorization.

2969920661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21678390.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 2969920661 is about 54496.9784575255. The cubic root of 2969920661 is about 1437.4131574608.

The spelling of 2969920661 in words is "two billion, nine hundred sixty-nine million, nine hundred twenty thousand, six hundred sixty-one".