642454055633 has 8 divisors (see below), whose sum is σ = 708748564776. Its totient is φ = 578570256000.

The previous prime is 642454055623. The next prime is 642454055653. The reversal of 642454055633 is 336550454246.

It can be written as a sum of positive squares in 4 ways, for example, as 40265639569 + 602188416064 = 200663^2 + 776008^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642454055633 - 2²² = 642449861329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642454055603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 602676818 + ... + 602677883.

It is an arithmetic number, because the mean of its divisors is an integer number (88593570597).

Almost surely, 2^642454055633 is an apocalyptic number.

It is an amenable number.

642454055633 is a deficient number, since it is larger than the sum of its proper divisors (66294509143).

642454055633 is a wasteful number, since it uses less digits than its factorization.

642454055633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205354755.

The product of its (nonzero) digits is 5184000, while the sum is 47.

The spelling of 642454055633 in words is "six hundred forty-two billion, four hundred fifty-four million, fifty-five thousand, six hundred thirty-three".