1664070754 has 4 divisors (see below), whose sum is σ = 2496106134. Its totient is φ = 832035376.

The previous prime is 1664070679. The next prime is 1664070757. The reversal of 1664070754 is 4570704661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4570704661 = 229 ⋅19959409.

It can be written as a sum of positive squares in only one way, i.e., 928847529 + 735223225 = 30477^2 + 27115^2 .

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 not an unprimeable number, because it can be changed into a prime (1664070757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416017687 + ... + 416017690.

Almost surely, 2^1664070754 is an apocalyptic number.

1664070754 is a deficient number, since it is larger than the sum of its proper divisors (832035380).

1664070754 is an equidigital number, since it uses as much as digits as its factorization.

1664070754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832035379.

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 1664070754 is about 40793.0233495876. The cubic root of 1664070754 is about 1185.0152226735.

The spelling of 1664070754 in words is "one billion, six hundred sixty-four million, seventy thousand, seven hundred fifty-four".