6662965921 has 4 divisors (see below), whose sum is σ = 6663332032. Its totient is φ = 6662599812.

The previous prime is 6662965913. The next prime is 6662965927. The reversal of 6662965921 is 1295692666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6662965921 - 2³ = 6662965913 is a prime.

It is a super-2 number, since 2×6662965921² = 88790229728814756482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6662965927) 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, 154245 + ... + 192658.

It is an arithmetic number, because the mean of its divisors is an integer number (1665833008).

Almost surely, 2^6662965921 is an apocalyptic number.

It is an amenable number.

6662965921 is a deficient number, since it is larger than the sum of its proper divisors (366111).

6662965921 is a wasteful number, since it uses less digits than its factorization.

6662965921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366110.

The product of its digits is 2099520, while the sum is 52.

The square root of 6662965921 is about 81626.9926004872. The cubic root of 6662965921 is about 1881.7237398017.

The spelling of 6662965921 in words is "six billion, six hundred sixty-two million, nine hundred sixty-five thousand, nine hundred twenty-one".