1861882378786 has 8 divisors (see below), whose sum is σ = 2840159561040. Its totient is φ = 915162525108.

The previous prime is 1861882378781. The next prime is 1861882378877. The reversal of 1861882378786 is 6878732881681.

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

It is not an unprimeable number, because it can be changed into a prime (1861882378781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7889331996 + ... + 7889332231.

It is an arithmetic number, because the mean of its divisors is an integer number (355019945130).

Almost surely, 2^{1861882378786} is an apocalyptic number.

1861882378786 is a deficient number, since it is larger than the sum of its proper divisors (978277182254).

1861882378786 is a wasteful number, since it uses less digits than its factorization.

1861882378786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15778664288.

The product of its digits is 346816512, while the sum is 73.

The spelling of 1861882378786 in words is "one trillion, eight hundred sixty-one billion, eight hundred eighty-two million, three hundred seventy-eight thousand, seven hundred eighty-six".