1861861887336 has 64 divisors (see below), whose sum is σ = 5084176870080. Its totient is φ = 563492602880.

The previous prime is 1861861887329. The next prime is 1861861887349. The reversal of 1861861887336 is 6337881681681.

It is a Harshad number since it is a multiple of its sum of digits (66).

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, 4214001 + ... + 4634816.

It is an arithmetic number, because the mean of its divisors is an integer number (79440263595).

Almost surely, 2^{1861861887336} is an apocalyptic number.

It is an amenable number.

1861861887336 is an abundant number, since it is smaller than the sum of its proper divisors (3222314982744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1861861887336 is a wasteful number, since it uses less digits than its factorization.

1861861887336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8849634 (or 8849630 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 66.

The spelling of 1861861887336 in words is "one trillion, eight hundred sixty-one billion, eight hundred sixty-one million, eight hundred eighty-seven thousand, three hundred thirty-six".