642612656233 has 4 divisors (see below), whose sum is σ = 642616479360. Its totient is φ = 642608833108.

The previous prime is 642612656173. The next prime is 642612656239. The reversal of 642612656233 is 332656216246.

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 a de Polignac number, because none of the positive numbers 2^k-642612656233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642612656239) 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, 1647253 + ... + 1999666.

It is an arithmetic number, because the mean of its divisors is an integer number (160654119840).

Almost surely, 2^642612656233 is an apocalyptic number.

It is an amenable number.

642612656233 is a deficient number, since it is larger than the sum of its proper divisors (3823127).

642612656233 is a wasteful number, since it uses less digits than its factorization.

642612656233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3823126.

The product of its digits is 1866240, while the sum is 46.

The spelling of 642612656233 in words is "six hundred forty-two billion, six hundred twelve million, six hundred fifty-six thousand, two hundred thirty-three".