3656121223 has 4 divisors (see below), whose sum is σ = 3656983528. Its totient is φ = 3655258920.

The previous prime is 3656121181. The next prime is 3656121229. The reversal of 3656121223 is 3221216563.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3221216563 = 53 ⋅60777671.

It is a cyclic number.

It is not a de Polignac number, because 3656121223 - 2¹³ = 3656113031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3656121229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424761 + ... + 433282.

It is an arithmetic number, because the mean of its divisors is an integer number (914245882).

Almost surely, 2^3656121223 is an apocalyptic number.

3656121223 is a deficient number, since it is larger than the sum of its proper divisors (862305).

3656121223 is an equidigital number, since it uses as much as digits as its factorization.

3656121223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862304.

The product of its digits is 12960, while the sum is 31.

The square root of 3656121223 is about 60465.8682481282. The cubic root of 3656121223 is about 1540.5419500058.

Adding to 3656121223 its reverse (3221216563), we get a palindrome (6877337786).

The spelling of 3656121223 in words is "three billion, six hundred fifty-six million, one hundred twenty-one thousand, two hundred twenty-three".