1961942973680 has 40 divisors (see below), whose sum is σ = 4561615662912. Its totient is φ = 784760286464.

The previous prime is 1961942973559. The next prime is 1961942973839. The reversal of 1961942973680 is 863792491691.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3876569 + ... + 4353351.

Almost surely, 2^{1961942973680} is an apocalyptic number.

1961942973680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1961942973680 is an abundant number, since it is smaller than the sum of its proper divisors (2599672689232).

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

1961942973680 is a wasteful number, since it uses less digits than its factorization.

1961942973680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528233 (or 528227 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 65.

The spelling of 1961942973680 in words is "one trillion, nine hundred sixty-one billion, nine hundred forty-two million, nine hundred seventy-three thousand, six hundred eighty".