645554642 has 16 divisors (see below), whose sum is σ = 976752000. Its totient is φ = 319977840.

The previous prime is 645554603. The next prime is 645554669. The reversal of 645554642 is 246455546.

645554642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×645554642³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645554642.

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, 251984 + ... + 254532.

It is an arithmetic number, because the mean of its divisors is an integer number (61047000).

Almost surely, 2^645554642 is an apocalyptic number.

645554642 is a deficient number, since it is larger than the sum of its proper divisors (331197358).

645554642 is a wasteful number, since it uses less digits than its factorization.

645554642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3601.

The product of its digits is 576000, while the sum is 41.

The square root of 645554642 is about 25407.7673556729. The cubic root of 645554642 is about 864.2598464337.

The spelling of 645554642 in words is "six hundred forty-five million, five hundred fifty-four thousand, six hundred forty-two".