5665401639 has 18 divisors (see below), whose sum is σ = 8211329880. Its totient is φ = 3764068056.

The previous prime is 5665401587. The next prime is 5665401647. The reversal of 5665401639 is 9361045665.

5665401639 is a `hidden beast` number, since 5 + 6 + 6 + 5 + 4 + 0 + 1 + 639 = 666.

It is not a de Polignac number, because 5665401639 - 2⁹ = 5665401127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5665401594 and 5665401603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5665401649) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 844902 + ... + 851580.

Almost surely, 2^5665401639 is an apocalyptic number.

5665401639 is a deficient number, since it is larger than the sum of its proper divisors (2545928241).

5665401639 is an equidigital number, since it uses as much as digits as its factorization.

5665401639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7299 (or 6989 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The square root of 5665401639 is about 75268.8623469227. The cubic root of 5665401639 is about 1782.6944043291.

The spelling of 5665401639 in words is "five billion, six hundred sixty-five million, four hundred one thousand, six hundred thirty-nine".