645260643546 has 8 divisors (see below), whose sum is σ = 1290521287104. Its totient is φ = 215086881180.

The previous prime is 645260643509. The next prime is 645260643569. The reversal of 645260643546 is 645346062546.

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

645260643546 is an admirable number.

It is a super-2 number, since 2×645260643546² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53771720290 + ... + 53771720301.

It is an arithmetic number, because the mean of its divisors is an integer number (161315160888).

Almost surely, 2^645260643546 is an apocalyptic number.

645260643546 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.

645260643546 is a wasteful number, since it uses less digits than its factorization.

645260643546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107543440596.

The product of its (nonzero) digits is 12441600, while the sum is 51.

The spelling of 645260643546 in words is "six hundred forty-five billion, two hundred sixty million, six hundred forty-three thousand, five hundred forty-six".