6635201091 has 4 divisors (see below), whose sum is σ = 8846934792. Its totient is φ = 4423467392.

The previous prime is 6635201087. The next prime is 6635201117. The reversal of 6635201091 is 1901025366.

It is a happy number.

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 6635201091 - 2² = 6635201087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6635201291) 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, 1105866846 + ... + 1105866851.

It is an arithmetic number, because the mean of its divisors is an integer number (2211733698).

Almost surely, 2^6635201091 is an apocalyptic number.

6635201091 is a deficient number, since it is larger than the sum of its proper divisors (2211733701).

6635201091 is a wasteful number, since it uses less digits than its factorization.

6635201091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211733700.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 6635201091 is about 81456.7436803117. The cubic root of 6635201091 is about 1879.1063629548.

The spelling of 6635201091 in words is "six billion, six hundred thirty-five million, two hundred one thousand, ninety-one".