1861347663 has 72 divisors (see below), whose sum is σ = 3418796160. Its totient is φ = 968647680.

The previous prime is 1861347637. The next prime is 1861347737. The reversal of 1861347663 is 3667431681.

It is not a de Polignac number, because 1861347663 - 2⁶ = 1861347599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861347613) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 228403 + ... + 236411.

It is an arithmetic number, because the mean of its divisors is an integer number (47483280).

Almost surely, 2^1861347663 is an apocalyptic number.

1861347663 is a deficient number, since it is larger than the sum of its proper divisors (1557448497).

1861347663 is a wasteful number, since it uses less digits than its factorization.

1861347663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8077 (or 8067 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 1861347663 is about 43143.3385703981. The cubic root of 1861347663 is about 1230.1058941152.

The spelling of 1861347663 in words is "one billion, eight hundred sixty-one million, three hundred forty-seven thousand, six hundred sixty-three".