645643626346546 has 32 divisors (see below), whose sum is σ = 1003378424760000. Its totient is φ = 311447608728000.

The previous prime is 645643626346507. The next prime is 645643626346687.

645643626346546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645643626346546² (a number of 30 digits) contains 22 as substring.

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, 243530296 + ... + 246167203.

It is an arithmetic number, because the mean of its divisors is an integer number (31355575773750).

Almost surely, 2^{645643626346546} is an apocalyptic number.

645643626346546 is a deficient number, since it is larger than the sum of its proper divisors (357734798413454).

645643626346546 is a wasteful number, since it uses less digits than its factorization.

645643626346546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489697770.

The product of its digits is 5374771200, while the sum is 70.

The spelling of 645643626346546 in words is "six hundred forty-five trillion, six hundred forty-three billion, six hundred twenty-six million, three hundred forty-six thousand, five hundred forty-six".