638636741043 has 16 divisors (see below), whose sum is σ = 991522273536. Its totient is φ = 358049708640.

The previous prime is 638636741033. The next prime is 638636741077. The reversal of 638636741043 is 340147636836.

It is not a de Polignac number, because 638636741043 - 2¹⁷ = 638636609971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638636741033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286897693 + ... + 286899918.

It is an arithmetic number, because the mean of its divisors is an integer number (61970142096).

Almost surely, 2^638636741043 is an apocalyptic number.

638636741043 is a deficient number, since it is larger than the sum of its proper divisors (352885532493).

638636741043 is a wasteful number, since it uses less digits than its factorization.

638636741043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573797674.

The product of its (nonzero) digits is 5225472, while the sum is 51.

The spelling of 638636741043 in words is "six hundred thirty-eight billion, six hundred thirty-six million, seven hundred forty-one thousand, forty-three".