3654656204021 has 16 divisors (see below), whose sum is σ = 3829017070080. Its totient is φ = 3481593287040.

The previous prime is 3654656203999. The next prime is 3654656204027. The reversal of 3654656204021 is 1204026564563.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3654656204021 - 2³⁰ = 3653582462197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3654656204027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17278721 + ... + 17488953.

It is an arithmetic number, because the mean of its divisors is an integer number (239313566880).

Almost surely, 2^{3654656204021} is an apocalyptic number.

It is an amenable number.

3654656204021 is a deficient number, since it is larger than the sum of its proper divisors (174360866059).

3654656204021 is a wasteful number, since it uses less digits than its factorization.

3654656204021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213316.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 3654656204021 in words is "three trillion, six hundred fifty-four billion, six hundred fifty-six million, two hundred four thousand, twenty-one".