1985642564195 has 8 divisors (see below), whose sum is σ = 2385175493760. Its totient is φ = 1586911106880.

The previous prime is 1985642564179. The next prime is 1985642564197. The reversal of 1985642564195 is 5914652465891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1985642564195 - 2⁴ = 1985642564179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1985642564197) 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, 200362610 + ... + 200372519.

It is an arithmetic number, because the mean of its divisors is an integer number (298146936720).

Almost surely, 2^{1985642564195} is an apocalyptic number.

1985642564195 is a deficient number, since it is larger than the sum of its proper divisors (399532929565).

1985642564195 is an equidigital number, since it uses as much as digits as its factorization.

1985642564195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400736125.

The product of its digits is 93312000, while the sum is 65.

The spelling of 1985642564195 in words is "one trillion, nine hundred eighty-five billion, six hundred forty-two million, five hundred sixty-four thousand, one hundred ninety-five".