3656620993 has 4 divisors (see below), whose sum is σ = 3718597680. Its totient is φ = 3594644308.

The previous prime is 3656620973. The next prime is 3656620999. The reversal of 3656620993 is 3990266563.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3656620993 - 2²¹ = 3654523841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3656620999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30988255 + ... + 30988372.

It is an arithmetic number, because the mean of its divisors is an integer number (929649420).

Almost surely, 2^3656620993 is an apocalyptic number.

It is an amenable number.

3656620993 is a deficient number, since it is larger than the sum of its proper divisors (61976687).

3656620993 is an equidigital number, since it uses as much as digits as its factorization.

3656620993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61976686.

The product of its (nonzero) digits is 1574640, while the sum is 49.

The square root of 3656620993 is about 60470.0007689763. Note that the first 3 decimals coincide. The cubic root of 3656620993 is about 1540.6121411114.

The spelling of 3656620993 in words is "three billion, six hundred fifty-six million, six hundred twenty thousand, nine hundred ninety-three".