645084210642 has 8 divisors (see below), whose sum is σ = 1290168421296. Its totient is φ = 215028070212.

The previous prime is 645084210577. The next prime is 645084210643. The reversal of 645084210642 is 246012480546.

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

645084210642 is an admirable number.

It is a super-2 number, since 2×645084210642² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645084210594 and 645084210603.

It is not an unprimeable number, because it can be changed into a prime (645084210643) 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, 53757017548 + ... + 53757017559.

It is an arithmetic number, because the mean of its divisors is an integer number (161271052662).

Almost surely, 2^645084210642 is an apocalyptic number.

645084210642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

645084210642 is a wasteful number, since it uses less digits than its factorization.

645084210642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107514035112.

The product of its (nonzero) digits is 368640, while the sum is 42.

The spelling of 645084210642 in words is "six hundred forty-five billion, eighty-four million, two hundred ten thousand, six hundred forty-two".