5261006661 has 4 divisors (see below), whose sum is σ = 7014675552. Its totient is φ = 3507337772.

The previous prime is 5261006633. The next prime is 5261006689. The reversal of 5261006661 is 1666001625.

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 an interprime number because it is at equal distance from previous prime (5261006633) and next prime (5261006689).

It is a cyclic number.

It is not a de Polignac number, because 5261006661 - 2¹⁴ = 5260990277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5261006761) 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, 876834441 + ... + 876834446.

It is an arithmetic number, because the mean of its divisors is an integer number (1753668888).

Almost surely, 2^5261006661 is an apocalyptic number.

It is an amenable number.

5261006661 is a deficient number, since it is larger than the sum of its proper divisors (1753668891).

5261006661 is a wasteful number, since it uses less digits than its factorization.

5261006661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753668890.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 5261006661 is about 72532.7971403282. The cubic root of 5261006661 is about 1739.2270602509.

The spelling of 5261006661 in words is "five billion, two hundred sixty-one million, six thousand, six hundred sixty-one".