667445364523 has 16 divisors (see below), whose sum is σ = 777421071360. Its totient is φ = 561168691776.

The previous prime is 667445364463. The next prime is 667445364577. The reversal of 667445364523 is 325463544766.

667445364523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 667445364523 - 2²¹ = 667443267371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667445364023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1579411 + ... + 1956892.

It is an arithmetic number, because the mean of its divisors is an integer number (48588816960).

Almost surely, 2^667445364523 is an apocalyptic number.

667445364523 is a deficient number, since it is larger than the sum of its proper divisors (109975706837).

667445364523 is a wasteful number, since it uses less digits than its factorization.

667445364523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3536826.

The product of its digits is 43545600, while the sum is 55.

The spelling of 667445364523 in words is "six hundred sixty-seven billion, four hundred forty-five million, three hundred sixty-four thousand, five hundred twenty-three".