5635640621 has 16 divisors (see below), whose sum is σ = 6139521024. Its totient is φ = 5142118464.

The previous prime is 5635640579. The next prime is 5635640627. The reversal of 5635640621 is 1260465365.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 5635640621 - 2¹⁴ = 5635624237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5635640627) 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, 451166 + ... + 463488.

It is an arithmetic number, because the mean of its divisors is an integer number (383720064).

Almost surely, 2^5635640621 is an apocalyptic number.

It is an amenable number.

5635640621 is a deficient number, since it is larger than the sum of its proper divisors (503880403).

5635640621 is a wasteful number, since it uses less digits than its factorization.

5635640621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12740.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 5635640621 is about 75070.9039575254. The cubic root of 5635640621 is about 1779.5673548721.

The spelling of 5635640621 in words is "five billion, six hundred thirty-five million, six hundred forty thousand, six hundred twenty-one".