1967999645 has 16 divisors (see below), whose sum is σ = 2525285808. Its totient is φ = 1467110400.

The previous prime is 1967999617. The next prime is 1967999749. The reversal of 1967999645 is 5469997691.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 594481924 + 1373517721 = 24382^2 + 37061^2 .

It is not a de Polignac number, because 1967999645 - 2⁸ = 1967999389 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 106034 + ... + 123203.

It is an arithmetic number, because the mean of its divisors is an integer number (157830363).

Almost surely, 2^1967999645 is an apocalyptic number.

It is an amenable number.

1967999645 is a deficient number, since it is larger than the sum of its proper divisors (557286163).

1967999645 is a wasteful number, since it uses less digits than its factorization.

1967999645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229360.

The product of its digits is 33067440, while the sum is 65.

The square root of 1967999645 is about 44362.1420244785. The cubic root of 1967999645 is about 1253.1652358604.

The spelling of 1967999645 in words is "one billion, nine hundred sixty-seven million, nine hundred ninety-nine thousand, six hundred forty-five".