642655233 has 48 divisors (see below), whose sum is σ = 1076115456. Its totient is φ = 365253120.

The previous prime is 642655219. The next prime is 642655243. The reversal of 642655233 is 332556246.

642655233 is a `hidden beast` number, since 642 + 6 + 5 + 5 + 2 + 3 + 3 = 666.

It is not a de Polignac number, because 642655233 - 2¹³ = 642647041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642655243) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 644091 + ... + 645087.

It is an arithmetic number, because the mean of its divisors is an integer number (22419072).

Almost surely, 2^642655233 is an apocalyptic number.

It is an amenable number.

642655233 is a deficient number, since it is larger than the sum of its proper divisors (433460223).

642655233 is a wasteful number, since it uses less digits than its factorization.

642655233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414 (or 1411 counting only the distinct ones).

The product of its digits is 129600, while the sum is 36.

The square root of 642655233 is about 25350.6456130805. The cubic root of 642655233 is about 862.9640079211.

The spelling of 642655233 in words is "six hundred forty-two million, six hundred fifty-five thousand, two hundred thirty-three".