664134678543 has 32 divisors (see below), whose sum is σ = 1013783592960. Its totient is φ = 378842652000.

The previous prime is 664134678533. The next prime is 664134678553. The reversal of 664134678543 is 345876431466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (664134678533) and next prime (664134678553).

It is not a de Polignac number, because 664134678543 - 2¹⁸ = 664134416399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664134678533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45397396 + ... + 45412022.

It is an arithmetic number, because the mean of its divisors is an integer number (31680737280).

Almost surely, 2^664134678543 is an apocalyptic number.

664134678543 is a deficient number, since it is larger than the sum of its proper divisors (349648914417).

664134678543 is a wasteful number, since it uses less digits than its factorization.

664134678543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18267.

The product of its digits is 34836480, while the sum is 57.

The spelling of 664134678543 in words is "six hundred sixty-four billion, one hundred thirty-four million, six hundred seventy-eight thousand, five hundred forty-three".