1980665379126 has 48 divisors (see below), whose sum is σ = 5024126828448. Its totient is φ = 552101846400.

The previous prime is 1980665379053. The next prime is 1980665379169. The reversal of 1980665379126 is 6219735660891.

1980665379126 is a `hidden beast` number, since 1 + 9 + 8 + 0 + 6 + 6 + 537 + 91 + 2 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191696865 + ... + 191707196.

It is an arithmetic number, because the mean of its divisors is an integer number (104669308926).

Almost surely, 2^{1980665379126} is an apocalyptic number.

1980665379126 is an abundant number, since it is smaller than the sum of its proper divisors (3043461449322).

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

1980665379126 is a wasteful number, since it uses less digits than its factorization.

1980665379126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383404117 (or 383404114 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 63.

The spelling of 1980665379126 in words is "one trillion, nine hundred eighty billion, six hundred sixty-five million, three hundred seventy-nine thousand, one hundred twenty-six".