6636120261 has 32 divisors (see below), whose sum is σ = 9162668160. Its totient is φ = 4270464000.

The previous prime is 6636120251. The next prime is 6636120263. The reversal of 6636120261 is 1620216366.

It is not a de Polignac number, because 6636120261 - 2¹¹ = 6636118213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6636120263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1966906 + ... + 1970276.

It is an arithmetic number, because the mean of its divisors is an integer number (286333380).

Almost surely, 2^6636120261 is an apocalyptic number.

It is an amenable number.

6636120261 is a deficient number, since it is larger than the sum of its proper divisors (2526547899).

6636120261 is a wasteful number, since it uses less digits than its factorization.

6636120261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 6636120261 is about 81462.3855592260. The cubic root of 6636120261 is about 1879.1931294004.

The spelling of 6636120261 in words is "six billion, six hundred thirty-six million, one hundred twenty thousand, two hundred sixty-one".