645610405520036 has 18 divisors (see below), whose sum is σ = 1241866296569430. Its totient is φ = 293459275236160.

The previous prime is 645610405519949. The next prime is 645610405520039. The reversal of 645610405520036 is 630025504016546.

It can be written as a sum of positive squares in only one way, i.e., 327132117198436 + 318478288321600 = 18086794^2 + 17845960^2 .

It is not an unprimeable number, because it can be changed into a prime (645610405520039) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 666952897781 + ... + 666952898748.

It is an arithmetic number, because the mean of its divisors is an integer number (68992572031635).

Almost surely, 2^{645610405520036} is an apocalyptic number.

It is an amenable number.

645610405520036 is a deficient number, since it is larger than the sum of its proper divisors (596255891049394).

645610405520036 is a wasteful number, since it uses less digits than its factorization.

645610405520036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333905796555 (or 1333905796542 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 47.

The spelling of 645610405520036 in words is "six hundred forty-five trillion, six hundred ten billion, four hundred five million, five hundred twenty thousand, thirty-six".