1980394137452 has 24 divisors (see below), whose sum is σ = 3486999493824. Its totient is φ = 984127160592.

The previous prime is 1980394137437. The next prime is 1980394137457. The reversal of 1980394137452 is 2547314930891.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1980394137457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1897658 + ... + 2749889.

It is an arithmetic number, because the mean of its divisors is an integer number (145291645576).

Almost surely, 2^{1980394137452} is an apocalyptic number.

It is an amenable number.

1980394137452 is a deficient number, since it is larger than the sum of its proper divisors (1506605356372).

1980394137452 is a wasteful number, since it uses less digits than its factorization.

1980394137452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4648205 (or 4648203 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 1980394137452 in words is "one trillion, nine hundred eighty billion, three hundred ninety-four million, one hundred thirty-seven thousand, four hundred fifty-two".