1664173734 has 8 divisors (see below), whose sum is σ = 3328347480. Its totient is φ = 554724576.

The previous prime is 1664173733. The next prime is 1664173793. The reversal of 1664173734 is 4373714661.

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

1664173734 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664173733) 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, 138681139 + ... + 138681150.

It is an arithmetic number, because the mean of its divisors is an integer number (416043435).

Almost surely, 2^1664173734 is an apocalyptic number.

1664173734 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664173734 is a wasteful number, since it uses less digits than its factorization.

1664173734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277362294.

The product of its digits is 254016, while the sum is 42.

The square root of 1664173734 is about 40794.2855557001. The cubic root of 1664173734 is about 1185.0396668165.

The spelling of 1664173734 in words is "one billion, six hundred sixty-four million, one hundred seventy-three thousand, seven hundred thirty-four".