1981435366995 has 32 divisors (see below), whose sum is σ = 3666849080832. Its totient is φ = 894885779712.

The previous prime is 1981435366991. The next prime is 1981435366997. The reversal of 1981435366995 is 5996635341891.

It is not a de Polignac number, because 1981435366995 - 2² = 1981435366991 is a prime.

It is a super-3 number, since 3×1981435366995³ (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 (1981435366991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113670882 + ... + 113688311.

It is an arithmetic number, because the mean of its divisors is an integer number (114589033776).

Almost surely, 2^{1981435366995} is an apocalyptic number.

1981435366995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1981435366995 is a deficient number, since it is larger than the sum of its proper divisors (1685413713837).

1981435366995 is a wasteful number, since it uses less digits than its factorization.

1981435366995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227359291.

The product of its digits is 188956800, while the sum is 69.

The spelling of 1981435366995 in words is "one trillion, nine hundred eighty-one billion, four hundred thirty-five million, three hundred sixty-six thousand, nine hundred ninety-five".