645554842 has 8 divisors (see below), whose sum is σ = 969285600. Its totient is φ = 322459644.

The previous prime is 645554839. The next prime is 645554909. The reversal of 645554842 is 248455546.

645554842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 156342 + ... + 160417.

It is an arithmetic number, because the mean of its divisors is an integer number (121160700).

Almost surely, 2^645554842 is an apocalyptic number.

645554842 is a deficient number, since it is larger than the sum of its proper divisors (323730758).

645554842 is a wasteful number, since it uses less digits than its factorization.

645554842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317780.

The product of its digits is 768000, while the sum is 43.

The square root of 645554842 is about 25407.7712914769. The cubic root of 645554842 is about 864.2599356862.

The spelling of 645554842 in words is "six hundred forty-five million, five hundred fifty-four thousand, eight hundred forty-two".