1643136374 has 16 divisors (see below), whose sum is σ = 2690130960. Its totient is φ = 746501760.

The previous prime is 1643136373. The next prime is 1643136379. The reversal of 1643136374 is 4736313461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643136373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28082 + ... + 63834.

It is an arithmetic number, because the mean of its divisors is an integer number (168133185).

Almost surely, 2^1643136374 is an apocalyptic number.

1643136374 is a deficient number, since it is larger than the sum of its proper divisors (1046994586).

1643136374 is a wasteful number, since it uses less digits than its factorization.

1643136374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37855.

The product of its digits is 108864, while the sum is 38.

The square root of 1643136374 is about 40535.6185841539. The cubic root of 1643136374 is about 1180.0249860648.

The spelling of 1643136374 in words is "one billion, six hundred forty-three million, one hundred thirty-six thousand, three hundred seventy-four".