1664345254 has 64 divisors (see below), whose sum is σ = 3127444992. Its totient is φ = 652608000.

The previous prime is 1664345209. The next prime is 1664345269. The reversal of 1664345254 is 4525434661.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 733029 + ... + 735295.

It is an arithmetic number, because the mean of its divisors is an integer number (48866328).

Almost surely, 2^1664345254 is an apocalyptic number.

1664345254 is a deficient number, since it is larger than the sum of its proper divisors (1463099738).

1664345254 is a wasteful number, since it uses less digits than its factorization.

1664345254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2461.

The product of its digits is 345600, while the sum is 40.

The square root of 1664345254 is about 40796.3877567610. The cubic root of 1664345254 is about 1185.0803779147.

The spelling of 1664345254 in words is "one billion, six hundred sixty-four million, three hundred forty-five thousand, two hundred fifty-four".