1861621823495 has 32 divisors (see below), whose sum is σ = 2589166123008. Its totient is φ = 1258513314048.

The previous prime is 1861621823461. The next prime is 1861621823527. The reversal of 1861621823495 is 5943281261681.

It is a cyclic number.

It is not a de Polignac number, because 1861621823495 - 2¹⁸ = 1861621561351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1861621823495.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5841362 + ... + 6151808.

It is an arithmetic number, because the mean of its divisors is an integer number (80911441344).

Almost surely, 2^{1861621823495} is an apocalyptic number.

1861621823495 is a deficient number, since it is larger than the sum of its proper divisors (727544299513).

1861621823495 is a wasteful number, since it uses less digits than its factorization.

1861621823495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312879.

The product of its digits is 4976640, while the sum is 56.

The spelling of 1861621823495 in words is "one trillion, eight hundred sixty-one billion, six hundred twenty-one million, eight hundred twenty-three thousand, four hundred ninety-five".