1861287365763 has 48 divisors (see below), whose sum is σ = 3086019046656. Its totient is φ = 1058951448000.

The previous prime is 1861287365747. The next prime is 1861287365771. The reversal of 1861287365763 is 3675637821681.

It is a happy number.

1861287365763 is a `hidden beast` number, since 1 + 8 + 6 + 1 + 28 + 7 + 36 + 576 + 3 = 666.

It is not a de Polignac number, because 1861287365763 - 2⁴ = 1861287365747 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 1861287365763.

It is not an unprimeable number, because it can be changed into a prime (1861287365723) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 44207920 + ... + 44250002.

It is an arithmetic number, because the mean of its divisors is an integer number (64292063472).

Almost surely, 2^{1861287365763} is an apocalyptic number.

1861287365763 is a deficient number, since it is larger than the sum of its proper divisors (1224731680893).

1861287365763 is a wasteful number, since it uses less digits than its factorization.

1861287365763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45144 (or 45141 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 63.

The spelling of 1861287365763 in words is "one trillion, eight hundred sixty-one billion, two hundred eighty-seven million, three hundred sixty-five thousand, seven hundred sixty-three".