645554737345 has 16 divisors (see below), whose sum is σ = 889781126400. Its totient is φ = 440441648064.

The previous prime is 645554737283. The next prime is 645554737391. The reversal of 645554737345 is 543737455546.

It is a cyclic number.

It is not a de Polignac number, because 645554737345 - 2³⁷ = 508115783873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645554737345.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46335802 + ... + 46349731.

It is an arithmetic number, because the mean of its divisors is an integer number (55611320400).

Almost surely, 2^645554737345 is an apocalyptic number.

It is an amenable number.

645554737345 is a deficient number, since it is larger than the sum of its proper divisors (244226389055).

645554737345 is a wasteful number, since it uses less digits than its factorization.

645554737345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92685744.

The product of its digits is 105840000, while the sum is 58.

The spelling of 645554737345 in words is "six hundred forty-five billion, five hundred fifty-four million, seven hundred thirty-seven thousand, three hundred forty-five".