642637055 has 8 divisors (see below), whose sum is σ = 772832832. Its totient is φ = 512997408.

The previous prime is 642637033. The next prime is 642637069. The reversal of 642637055 is 550736246.

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 642637055 - 2⁶ = 642636991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136484 + ... + 141113.

It is an arithmetic number, because the mean of its divisors is an integer number (96604104).

Almost surely, 2^642637055 is an apocalyptic number.

642637055 is a deficient number, since it is larger than the sum of its proper divisors (130195777).

642637055 is a wasteful number, since it uses less digits than its factorization.

642637055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278065.

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 642637055 is about 25350.2870792423. The cubic root of 642637055 is about 862.9558713097.

The spelling of 642637055 in words is "six hundred forty-two million, six hundred thirty-seven thousand, fifty-five".