1963393874638 has 64 divisors (see below), whose sum is σ = 3568555077120. Its totient is φ = 792710335872.

The previous prime is 1963393874597. The next prime is 1963393874641. The reversal of 1963393874638 is 8364783933691.

It is a happy number.

It is a Smith number, since the sum of its digits (70) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1360956 + ... + 2403952.

It is an arithmetic number, because the mean of its divisors is an integer number (55758673080).

Almost surely, 2^{1963393874638} is an apocalyptic number.

1963393874638 is a deficient number, since it is larger than the sum of its proper divisors (1605161202482).

1963393874638 is a wasteful number, since it uses less digits than its factorization.

1963393874638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043161.

The product of its digits is 423263232, while the sum is 70.

The spelling of 1963393874638 in words is "one trillion, nine hundred sixty-three billion, three hundred ninety-three million, eight hundred seventy-four thousand, six hundred thirty-eight".