664154 has 8 divisors (see below), whose sum is σ = 1010100. Its totient is φ = 327456.

The previous prime is 664151. The next prime is 664177. The reversal of 664154 is 451466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 648025 + 16129 = 805^2 + 127^2 .

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

It is a super-2 number, since 2×664154² = 882201071432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664151) 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, 2129 + ... + 2420.

2⁶⁶⁴¹⁵⁴ is an apocalyptic number.

664154 is a deficient number, since it is larger than the sum of its proper divisors (345946).

664154 is a wasteful number, since it uses less digits than its factorization.

664154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4624.

The product of its digits is 2880, while the sum is 26.

The square root of 664154 is about 814.9564405537. The cubic root of 664154 is about 87.2481574748.

Subtracting from 664154 its sum of digits (26), we obtain a triangular number (664128 = T₁₁₅₂).

It can be divided in two parts, 664 and 154, that added together give a palindrome (818).

The spelling of 664154 in words is "six hundred sixty-four thousand, one hundred fifty-four".