664423134949 has 4 divisors (see below), whose sum is σ = 759340725664. Its totient is φ = 569505544236.

The previous prime is 664423134937. The next prime is 664423134989. The reversal of 664423134949 is 949431324466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664423134949 - 2⁵ = 664423134917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664423134949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664423134989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47458795347 + ... + 47458795360.

It is an arithmetic number, because the mean of its divisors is an integer number (189835181416).

Almost surely, 2^664423134949 is an apocalyptic number.

It is an amenable number.

664423134949 is a deficient number, since it is larger than the sum of its proper divisors (94917590715).

664423134949 is an equidigital number, since it uses as much as digits as its factorization.

664423134949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94917590714.

The product of its digits is 13436928, while the sum is 55.

The spelling of 664423134949 in words is "six hundred sixty-four billion, four hundred twenty-three million, one hundred thirty-four thousand, nine hundred forty-nine".