664421015602 has 8 divisors (see below), whose sum is σ = 1023567510636. Its totient is φ = 323231845392.

The previous prime is 664421015593. The next prime is 664421015611. The reversal of 664421015602 is 206510124466.

It is an interprime number because it is at equal distance from previous prime (664421015593) and next prime (664421015611).

It can be written as a sum of positive squares in 2 ways, for example, as 658579317841 + 5841697761 = 811529^2 + 76431^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4489331113 + ... + 4489331260.

Almost surely, 2^664421015602 is an apocalyptic number.

664421015602 is a deficient number, since it is larger than the sum of its proper divisors (359146495034).

664421015602 is a wasteful number, since it uses less digits than its factorization.

664421015602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8978662412.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 664421015602 in words is "six hundred sixty-four billion, four hundred twenty-one million, fifteen thousand, six hundred two".