645370443154 has 8 divisors (see below), whose sum is σ = 968126217660. Its totient is φ = 322661703936.

The previous prime is 645370443143. The next prime is 645370443161. The reversal of 645370443154 is 451344073546.

It can be written as a sum of positive squares in 2 ways, for example, as 640763427529 + 4607015625 = 800477^2 + 67875^2 .

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, 11724499 + ... + 11779414.

Almost surely, 2^645370443154 is an apocalyptic number.

645370443154 is a deficient number, since it is larger than the sum of its proper divisors (322755774506).

645370443154 is a wasteful number, since it uses less digits than its factorization.

645370443154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23517644.

The product of its (nonzero) digits is 2419200, while the sum is 46.

The spelling of 645370443154 in words is "six hundred forty-five billion, three hundred seventy million, four hundred forty-three thousand, one hundred fifty-four".