645623543662 has 4 divisors (see below), whose sum is σ = 968435315496. Its totient is φ = 322811771830.

The previous prime is 645623543651. The next prime is 645623543681. The reversal of 645623543662 is 266345326546.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161405885914 + ... + 161405885917.

It is an arithmetic number, because the mean of its divisors is an integer number (242108828874).

Almost surely, 2^645623543662 is an apocalyptic number.

645623543662 is a deficient number, since it is larger than the sum of its proper divisors (322811771834).

645623543662 is a wasteful number, since it uses less digits than its factorization.

645623543662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322811771833.

The product of its digits is 18662400, while the sum is 52.

The spelling of 645623543662 in words is "six hundred forty-five billion, six hundred twenty-three million, five hundred forty-three thousand, six hundred sixty-two".