1861506743992 has 32 divisors (see below), whose sum is σ = 4086234321120. Its totient is φ = 778330344960.

The previous prime is 1861506743977. The next prime is 1861506744037. The reversal of 1861506743992 is 2993476051681.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1861506743992.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405378093 + ... + 405382684.

It is an arithmetic number, because the mean of its divisors is an integer number (127694822535).

It is a 1-persistent number, because it is pandigital, but 2⋅1861506743992 = 3723013487984 is not.

Almost surely, 2^{1861506743992} is an apocalyptic number.

It is an amenable number.

1861506743992 is an abundant number, since it is smaller than the sum of its proper divisors (2224727577128).

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

1861506743992 is a wasteful number, since it uses less digits than its factorization.

1861506743992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810760831 (or 810760827 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 1861506743992 in words is "one trillion, eight hundred sixty-one billion, five hundred six million, seven hundred forty-three thousand, nine hundred ninety-two".