6635666101 has 4 divisors (see below), whose sum is σ = 6642322732. Its totient is φ = 6629009472.

The previous prime is 6635666003. The next prime is 6635666137. The reversal of 6635666101 is 1016665366.

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 6103671876 + 531994225 = 78126^2 + 23065^2 .

It is a cyclic number.

It is not a de Polignac number, because 6635666101 - 2²³ = 6627277493 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 (6635666171) 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, 3326820 + ... + 3328813.

It is an arithmetic number, because the mean of its divisors is an integer number (1660580683).

Almost surely, 2^6635666101 is an apocalyptic number.

It is an amenable number.

6635666101 is a deficient number, since it is larger than the sum of its proper divisors (6656631).

6635666101 is an equidigital number, since it uses as much as digits as its factorization.

6635666101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6656630.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 6635666101 is about 81459.5979673359. The cubic root of 6635666101 is about 1879.1502592801.

The spelling of 6635666101 in words is "six billion, six hundred thirty-five million, six hundred sixty-six thousand, one hundred one".