1861863350516 has 12 divisors (see below), whose sum is σ = 3508896314532. Its totient is φ = 859321546368.

The previous prime is 1861863350483. The next prime is 1861863350533. The reversal of 1861863350516 is 6150533681681.

It can be written as a sum of positive squares in 2 ways, for example, as 104197257616 + 1757666092900 = 322796^2 + 1325770^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17902532165 + ... + 17902532268.

It is an arithmetic number, because the mean of its divisors is an integer number (292408026211).

Almost surely, 2^{1861863350516} is an apocalyptic number.

It is an amenable number.

1861863350516 is a deficient number, since it is larger than the sum of its proper divisors (1647032964016).

1861863350516 is a wasteful number, since it uses less digits than its factorization.

1861863350516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35805064450 (or 35805064448 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 1861863350516 in words is "one trillion, eight hundred sixty-one billion, eight hundred sixty-three million, three hundred fifty thousand, five hundred sixteen".