1945515664 has 15 divisors (see below), whose sum is σ = 3769778467. Its totient is φ = 972669616.

The previous prime is 1945515661. The next prime is 1945515707. The reversal of 1945515664 is 4665155491.

It is a happy number.

The square root of 1945515664 is 44108.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1945515661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 170919 + ... + 181945.

Almost surely, 2^1945515664 is an apocalyptic number.

1945515664 is the 44108-th square number.

It is an amenable number.

1945515664 is a deficient number, since it is larger than the sum of its proper divisors (1824262803).

1945515664 is an frugal number, since it uses more digits than its factorization.

1945515664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22062 (or 11029 counting only the distinct ones).

The product of its digits is 648000, while the sum is 46.

The cubic root of 1945515664 is about 1248.3745622646.

The spelling of 1945515664 in words is "one billion, nine hundred forty-five million, five hundred fifteen thousand, six hundred sixty-four".