1861508951616 has 28 divisors (see below), whose sum is σ = 4925242434992. Its totient is φ = 620502983808.

The previous prime is 1861508951591. The next prime is 1861508951711. The reversal of 1861508951616 is 6161598051681.

It is a super-2 number, since 2×1861508951616² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

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, 4847679370 + ... + 4847679753.

Almost surely, 2^{1861508951616} is an apocalyptic number.

1861508951616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1861508951616 is an abundant number, since it is smaller than the sum of its proper divisors (3063733483376).

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

1861508951616 is an equidigital number, since it uses as much as digits as its factorization.

1861508951616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9695359138 (or 9695359128 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 57.

The spelling of 1861508951616 in words is "one trillion, eight hundred sixty-one billion, five hundred eight million, nine hundred fifty-one thousand, six hundred sixteen".