642318057618 has 32 divisors (see below), whose sum is σ = 1360248396480. Its totient is φ = 201504814080.

The previous prime is 642318057551. The next prime is 642318057673. The reversal of 642318057618 is 816750813246.

It is a super-3 number, since 3×642318057618³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3598218 + ... + 3772506.

It is an arithmetic number, because the mean of its divisors is an integer number (42507762390).

Almost surely, 2^642318057618 is an apocalyptic number.

642318057618 is an abundant number, since it is smaller than the sum of its proper divisors (717930338862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642318057618 is a wasteful number, since it uses less digits than its factorization.

642318057618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210442.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 642318057618 in words is "six hundred forty-two billion, three hundred eighteen million, fifty-seven thousand, six hundred eighteen".