3261661623 has 12 divisors (see below), whose sum is σ = 5139588168. Its totient is φ = 1976764560.

The previous prime is 3261661597. The next prime is 3261661673.

3261661623 is a `hidden beast` number, since 3 + 2 + 6 + 16 + 616 + 23 = 666.

3261661623 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 3261661623 - 2⁵ = 3261661591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3261661673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16472940 + ... + 16473137.

It is an arithmetic number, because the mean of its divisors is an integer number (428299014).

Almost surely, 2^3261661623 is an apocalyptic number.

3261661623 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

3261661623 is a deficient number, since it is larger than the sum of its proper divisors (1877926545).

3261661623 is a wasteful number, since it uses less digits than its factorization.

3261661623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32946094 (or 32946091 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 3261661623 is about 57110.9588695550. The cubic root of 3261661623 is about 1483.0175866873.

The spelling of 3261661623 in words is "three billion, two hundred sixty-one million, six hundred sixty-one thousand, six hundred twenty-three".