3665437521 has 8 divisors (see below), whose sum is σ = 4887980160. Its totient is φ = 2443259952.

The previous prime is 3665437493. The next prime is 3665437537. The reversal of 3665437521 is 1257345663.

3665437521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 3665437521 - 2²² = 3661243217 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3665437591) 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, 66910 + ... + 108663.

It is an arithmetic number, because the mean of its divisors is an integer number (610997520).

Almost surely, 2^3665437521 is an apocalyptic number.

It is an amenable number.

3665437521 is a deficient number, since it is larger than the sum of its proper divisors (1222542639).

3665437521 is a wasteful number, since it uses less digits than its factorization.

3665437521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182535.

The product of its digits is 453600, while the sum is 42.

The square root of 3665437521 is about 60542.8568949302. The cubic root of 3665437521 is about 1541.8493441746.

The spelling of 3665437521 in words is "three billion, six hundred sixty-five million, four hundred thirty-seven thousand, five hundred twenty-one".