645877640386 has 16 divisors (see below), whose sum is σ = 1070269050240. Its totient is φ = 289864532880.

The previous prime is 645877640329. The next prime is 645877640393. The reversal of 645877640386 is 683046778546.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185808861 + ... + 185812336.

It is an arithmetic number, because the mean of its divisors is an integer number (66891815640).

Almost surely, 2^645877640386 is an apocalyptic number.

645877640386 is a deficient number, since it is larger than the sum of its proper divisors (424391409854).

645877640386 is a wasteful number, since it uses less digits than its factorization.

645877640386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371621289.

The product of its (nonzero) digits is 162570240, while the sum is 64.

The spelling of 645877640386 in words is "six hundred forty-five billion, eight hundred seventy-seven million, six hundred forty thousand, three hundred eighty-six".