664110451 has 4 divisors (see below), whose sum is σ = 670685904. Its totient is φ = 657535000.

The previous prime is 664110407. The next prime is 664110467. The reversal of 664110451 is 154011466.

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

It is a cyclic number.

It is not a de Polignac number, because 664110451 - 2⁷ = 664110323 is a prime.

It is a super-2 number, since 2×664110451² = 882085382254846802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664110751) 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, 3287575 + ... + 3287776.

It is an arithmetic number, because the mean of its divisors is an integer number (167671476).

Almost surely, 2^664110451 is an apocalyptic number.

664110451 is a deficient number, since it is larger than the sum of its proper divisors (6575453).

664110451 is a wasteful number, since it uses less digits than its factorization.

664110451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6575452.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 664110451 is about 25770.3405293760. The cubic root of 664110451 is about 872.4625046078.

The spelling of 664110451 in words is "six hundred sixty-four million, one hundred ten thousand, four hundred fifty-one".