1999861471881 has 40 divisors (see below), whose sum is σ = 3676858332224. Its totient is φ = 1054871981280.

The previous prime is 1999861471859. The next prime is 1999861471891. The reversal of 1999861471881 is 1881741689991.

1999861471881 is a `hidden beast` number, since 1 + 9 + 9 + 98 + 61 + 471 + 8 + 8 + 1 = 666.

It is not a de Polignac number, because 1999861471881 - 2⁷ = 1999861471753 is a prime.

It is a super-3 number, since 3×1999861471881³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1999861471891) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 135650035 + ... + 135664776.

Almost surely, 2^{1999861471881} is an apocalyptic number.

It is an amenable number.

1999861471881 is a deficient number, since it is larger than the sum of its proper divisors (1676996860343).

1999861471881 is a wasteful number, since it uses less digits than its factorization.

1999861471881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271314843 (or 271314834 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 72.

It can be divided in two parts, 1999861 and 471881, that added together give a palindrome (2471742).

The spelling of 1999861471881 in words is "one trillion, nine hundred ninety-nine billion, eight hundred sixty-one million, four hundred seventy-one thousand, eight hundred eighty-one".