128201196685838 has 4 divisors (see below), whose sum is σ = 192301795028760. Its totient is φ = 64100598342918.

The previous prime is 128201196685819. The next prime is 128201196685927. The reversal of 128201196685838 is 838586691102821.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32050299171458 + ... + 32050299171461.

It is an arithmetic number, because the mean of its divisors is an integer number (48075448757190).

Almost surely, 2^{128201196685838} is an apocalyptic number.

128201196685838 is a deficient number, since it is larger than the sum of its proper divisors (64100598342922).

128201196685838 is an equidigital number, since it uses as much as digits as its factorization.

128201196685838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64100598342921.

The product of its (nonzero) digits is 79626240, while the sum is 68.

The spelling of 128201196685838 in words is "one hundred twenty-eight trillion, two hundred one billion, one hundred ninety-six million, six hundred eighty-five thousand, eight hundred thirty-eight".