646740660226353 has 64 divisors (see below), whose sum is σ = 1139597683365888. Its totient is φ = 315857651051520.

The previous prime is 646740660226321. The next prime is 646740660226399. The reversal of 646740660226353 is 353622066047646.

It is not a de Polignac number, because 646740660226353 - 2⁵ = 646740660226321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646740660226153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 87226950 + ... + 94350527.

It is an arithmetic number, because the mean of its divisors is an integer number (17806213802592).

Almost surely, 2^{646740660226353} is an apocalyptic number.

It is an amenable number.

646740660226353 is a deficient number, since it is larger than the sum of its proper divisors (492857023139535).

646740660226353 is a wasteful number, since it uses less digits than its factorization.

646740660226353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181578422.

The product of its (nonzero) digits is 156764160, while the sum is 60.

The spelling of 646740660226353 in words is "six hundred forty-six trillion, seven hundred forty billion, six hundred sixty million, two hundred twenty-six thousand, three hundred fifty-three".