23551661 has 8 divisors (see below), whose sum is σ = 27784704. Its totient is φ = 19535760.

The previous prime is 23551651. The next prime is 23551669. The reversal of 23551661 is 16615532.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23551661 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 (23551669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54050 + ... + 54483.

It is an arithmetic number, because the mean of its divisors is an integer number (3473088).

Almost surely, 2^23551661 is an apocalyptic number.

It is an amenable number.

23551661 is a deficient number, since it is larger than the sum of its proper divisors (4233043).

23551661 is a wasteful number, since it uses less digits than its factorization.

23551661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108571.

The product of its digits is 5400, while the sum is 29.

The square root of 23551661 is about 4853.0053575079. The cubic root of 23551661 is about 286.6424543880.

It can be divided in two parts, 23 and 551661, that multiplied together give a triangular number (12688203 = T₅₀₃₇).

The spelling of 23551661 in words is "twenty-three million, five hundred fifty-one thousand, six hundred sixty-one".