45551661 has 12 divisors (see below), whose sum is σ = 63493248. Its totient is φ = 29046424.

The previous prime is 45551629. The next prime is 45551669. The reversal of 45551661 is 16615554.

It is not a de Polignac number, because 45551661 - 2⁵ = 45551629 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45551669) 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, 12765 + ... + 15938.

It is an arithmetic number, because the mean of its divisors is an integer number (5291104).

Almost surely, 2^45551661 is an apocalyptic number.

It is an amenable number.

45551661 is a deficient number, since it is larger than the sum of its proper divisors (17941587).

45551661 is a wasteful number, since it uses less digits than its factorization.

45551661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28752 (or 28729 counting only the distinct ones).

The product of its digits is 18000, while the sum is 33.

The square root of 45551661 is about 6749.1970633550. The cubic root of 45551661 is about 357.1369120763.

It can be divided in two parts, 4555 and 1661, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 45551661 in words is "forty-five million, five hundred fifty-one thousand, six hundred sixty-one".