664154623 has 8 divisors (see below), whose sum is σ = 767152080. Its totient is φ = 568260480.

The previous prime is 664154597. The next prime is 664154639. The reversal of 664154623 is 326451466.

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

It is a cyclic number.

It is not a de Polignac number, because 664154623 - 2⁵ = 664154591 is a prime.

It is a super-2 number, since 2×664154623² = 882202726504544258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664154683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1775628 + ... + 1776001.

It is an arithmetic number, because the mean of its divisors is an integer number (95894010).

Almost surely, 2^664154623 is an apocalyptic number.

664154623 is a deficient number, since it is larger than the sum of its proper divisors (102997457).

664154623 is a wasteful number, since it uses less digits than its factorization.

664154623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3551657.

The product of its digits is 103680, while the sum is 37.

The square root of 664154623 is about 25771.1975468739. The cubic root of 664154623 is about 872.4818475546.

The spelling of 664154623 in words is "six hundred sixty-four million, one hundred fifty-four thousand, six hundred twenty-three".