664581373051 has 4 divisors (see below), whose sum is σ = 664583058504. Its totient is φ = 664579687600.

The previous prime is 664581373007. The next prime is 664581373063. The reversal of 664581373051 is 150373185466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664581373051 - 2³⁵ = 630221634683 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664581372986 and 664581373004.

It is not an unprimeable number, because it can be changed into a prime (664581379051) 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 3 ways as a sum of consecutive naturals, for example, 101031 + ... + 1157311.

It is an arithmetic number, because the mean of its divisors is an integer number (166145764626).

Almost surely, 2^664581373051 is an apocalyptic number.

664581373051 is a deficient number, since it is larger than the sum of its proper divisors (1685453).

664581373051 is a wasteful number, since it uses less digits than its factorization.

664581373051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685452.

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 664581373051 in words is "six hundred sixty-four billion, five hundred eighty-one million, three hundred seventy-three thousand, fifty-one".