645878878546 has 8 divisors (see below), whose sum is σ = 1056892710384. Its totient is φ = 293581308420.

The previous prime is 645878878537. The next prime is 645878878577.

645878878546 is nontrivially palindromic in base 10.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14679065400 + ... + 14679065443.

It is an arithmetic number, because the mean of its divisors is an integer number (132111588798).

Almost surely, 2^645878878546 is an apocalyptic number.

645878878546 is a deficient number, since it is larger than the sum of its proper divisors (411013831838).

645878878546 is a wasteful number, since it uses less digits than its factorization.

645878878546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29358130856.

The product of its digits is 2890137600, while the sum is 76.

The spelling of 645878878546 in words is "six hundred forty-five billion, eight hundred seventy-eight million, eight hundred seventy-eight thousand, five hundred forty-six".