646244555634345 has 32 divisors (see below), whose sum is σ = 1059248059752960. Its totient is φ = 336245434204160.

The previous prime is 646244555634331. The next prime is 646244555634371. The reversal of 646244555634345 is 543436555442646.

It is a happy number.

It is not a de Polignac number, because 646244555634345 - 2¹⁰ = 646244555633321 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1174929 + ... + 35970398.

It is an arithmetic number, because the mean of its divisors is an integer number (33101501867280).

Almost surely, 2^{646244555634345} is an apocalyptic number.

It is an amenable number.

646244555634345 is a deficient number, since it is larger than the sum of its proper divisors (413003504118615).

646244555634345 is a wasteful number, since it uses less digits than its factorization.

646244555634345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37173665.

The product of its digits is 2488320000, while the sum is 66.

The spelling of 646244555634345 in words is "six hundred forty-six trillion, two hundred forty-four billion, five hundred fifty-five million, six hundred thirty-four thousand, three hundred forty-five".