6616900261 has 4 divisors (see below), whose sum is σ = 6664504000. Its totient is φ = 6569296524.

The previous prime is 6616900253. The next prime is 6616900321. The reversal of 6616900261 is 1620096166.

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 6616900261 - 2³ = 6616900253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6616900261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6616900211) 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, 23801661 + ... + 23801938.

It is an arithmetic number, because the mean of its divisors is an integer number (1666126000).

Almost surely, 2^6616900261 is an apocalyptic number.

It is an amenable number.

6616900261 is a deficient number, since it is larger than the sum of its proper divisors (47603739).

6616900261 is a wasteful number, since it uses less digits than its factorization.

6616900261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47603738.

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

The square root of 6616900261 is about 81344.3314620017. The cubic root of 6616900261 is about 1877.3771578189.

The spelling of 6616900261 in words is "six billion, six hundred sixteen million, nine hundred thousand, two hundred sixty-one".