664122154 has 4 divisors (see below), whose sum is σ = 996183234. Its totient is φ = 332061076.

The previous prime is 664122133. The next prime is 664122197. The reversal of 664122154 is 451221466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 365765625 + 298356529 = 19125^2 + 17273^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166030537 + ... + 166030540.

Almost surely, 2^664122154 is an apocalyptic number.

664122154 is a deficient number, since it is larger than the sum of its proper divisors (332061080).

664122154 is a wasteful number, since it uses less digits than its factorization.

664122154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332061079.

The product of its digits is 11520, while the sum is 31.

The square root of 664122154 is about 25770.5675917315. The cubic root of 664122154 is about 872.4676294425.

The spelling of 664122154 in words is "six hundred sixty-four million, one hundred twenty-two thousand, one hundred fifty-four".