1981437908908 has 24 divisors (see below), whose sum is σ = 3650156259120. Its totient is φ = 938540093760.

The previous prime is 1981437908839. The next prime is 1981437908999. The reversal of 1981437908908 is 8098097341891.

It is a super-3 number, since 3×1981437908908³ (a number of 38 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1567410 + ... + 2533702.

It is an arithmetic number, because the mean of its divisors is an integer number (152089844130).

Almost surely, 2^{1981437908908} is an apocalyptic number.

It is an amenable number.

1981437908908 is a deficient number, since it is larger than the sum of its proper divisors (1668718350212).

1981437908908 is a wasteful number, since it uses less digits than its factorization.

1981437908908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993297 (or 993295 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 67.

The spelling of 1981437908908 in words is "one trillion, nine hundred eighty-one billion, four hundred thirty-seven million, nine hundred eight thousand, nine hundred eight".