1861645585942 has 32 divisors (see below), whose sum is σ = 2990007564192. Its totient is φ = 867912724224.

The previous prime is 1861645585901. The next prime is 1861645585957. The reversal of 1861645585942 is 2495855461681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5350743 + ... + 5688034.

It is an arithmetic number, because the mean of its divisors is an integer number (93437736381).

Almost surely, 2^{1861645585942} is an apocalyptic number.

1861645585942 is a deficient number, since it is larger than the sum of its proper divisors (1128361978250).

1861645585942 is a wasteful number, since it uses less digits than its factorization.

1861645585942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11038912.

The product of its digits is 82944000, while the sum is 64.

The spelling of 1861645585942 in words is "one trillion, eight hundred sixty-one billion, six hundred forty-five million, five hundred eighty-five thousand, nine hundred forty-two".