1861612361622 has 40 divisors (see below), whose sum is σ = 4492266872016. Its totient is φ = 572803802928.

The previous prime is 1861612361617. The next prime is 1861612361647. The reversal of 1861612361622 is 2261632161681.

1861612361622 is a `hidden beast` number, since 1 + 8 + 6 + 1 + 6 + 1 + 2 + 3 + 616 + 22 = 666.

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 19 ways as a sum of consecutive naturals, for example, 441976138 + ... + 441980349.

Almost surely, 2^{1861612361622} is an apocalyptic number.

1861612361622 is an abundant number, since it is smaller than the sum of its proper divisors (2630654510394).

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

1861612361622 is a wasteful number, since it uses less digits than its factorization.

1861612361622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883956514 (or 883956505 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The spelling of 1861612361622 in words is "one trillion, eight hundred sixty-one billion, six hundred twelve million, three hundred sixty-one thousand, six hundred twenty-two".