645673376546 has 32 divisors (see below), whose sum is σ = 1103833986048. Its totient is φ = 280386271440.

The previous prime is 645673376527. The next prime is 645673376573.

645673376546 is nontrivially palindromic in base 10.

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, 358796 + ... + 1191671.

It is an arithmetic number, because the mean of its divisors is an integer number (34494812064).

Almost surely, 2^645673376546 is an apocalyptic number.

645673376546 is a deficient number, since it is larger than the sum of its proper divisors (458160609502).

645673376546 is a wasteful number, since it uses less digits than its factorization.

645673376546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551326.

The product of its digits is 228614400, while the sum is 62.

The spelling of 645673376546 in words is "six hundred forty-five billion, six hundred seventy-three million, three hundred seventy-six thousand, five hundred forty-six".