645476681478 has 8 divisors (see below), whose sum is σ = 1290953362968. Its totient is φ = 215158893824.

The previous prime is 645476681459. The next prime is 645476681527. The reversal of 645476681478 is 874186674546.

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

645476681478 is an admirable number.

It is a congruent number.

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, 53789723451 + ... + 53789723462.

It is an arithmetic number, because the mean of its divisors is an integer number (161369170371).

Almost surely, 2^645476681478 is an apocalyptic number.

645476681478 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.

645476681478 is a wasteful number, since it uses less digits than its factorization.

645476681478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107579446918.

The product of its digits is 216760320, while the sum is 66.

The spelling of 645476681478 in words is "six hundred forty-five billion, four hundred seventy-six million, six hundred eighty-one thousand, four hundred seventy-eight".