6691220902 has 4 divisors (see below), whose sum is σ = 10036831356. Its totient is φ = 3345610450.

The previous prime is 6691220891. The next prime is 6691220909. The reversal of 6691220902 is 2090221966.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6691220909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1672805224 + ... + 1672805227.

It is an arithmetic number, because the mean of its divisors is an integer number (2509207839).

Almost surely, 2^6691220902 is an apocalyptic number.

6691220902 is a deficient number, since it is larger than the sum of its proper divisors (3345610454).

6691220902 is a wasteful number, since it uses less digits than its factorization.

6691220902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3345610453.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 6691220902 is about 81799.8832639754. The cubic root of 6691220902 is about 1884.3798687611.

The spelling of 6691220902 in words is "six billion, six hundred ninety-one million, two hundred twenty thousand, nine hundred two".