664120454 has 4 divisors (see below), whose sum is σ = 996180684. Its totient is φ = 332060226.

The previous prime is 664120441. The next prime is 664120477. The reversal of 664120454 is 454021466.

664120454 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 454021466 = 2 ⋅227010733.

It is a super-2 number, since 2×664120454² = 882111954842332232, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 664120454.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166030112 + ... + 166030115.

It is an arithmetic number, because the mean of its divisors is an integer number (249045171).

Almost surely, 2^664120454 is an apocalyptic number.

664120454 is a deficient number, since it is larger than the sum of its proper divisors (332060230).

664120454 is a wasteful number, since it uses less digits than its factorization.

664120454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332060229.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 664120454 is about 25770.5346083468. The cubic root of 664120454 is about 872.4668850030.

The spelling of 664120454 in words is "six hundred sixty-four million, one hundred twenty thousand, four hundred fifty-four".