642870212587 has 4 divisors (see below), whose sum is σ = 643863830256. Its totient is φ = 641876594920.

The previous prime is 642870212581. The next prime is 642870212591. The reversal of 642870212587 is 785212078246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642870212587 is a prime.

It is a super-2 number, since 2×642870212587² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642870212581) 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, 496807864 + ... + 496809157.

It is an arithmetic number, because the mean of its divisors is an integer number (160965957564).

Almost surely, 2^642870212587 is an apocalyptic number.

642870212587 is a deficient number, since it is larger than the sum of its proper divisors (993617669).

642870212587 is an equidigital number, since it uses as much as digits as its factorization.

642870212587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993617668.

The product of its (nonzero) digits is 3010560, while the sum is 52.

The spelling of 642870212587 in words is "six hundred forty-two billion, eight hundred seventy million, two hundred twelve thousand, five hundred eighty-seven".