1980171948677 has 16 divisors (see below), whose sum is σ = 2184578844672. Its totient is φ = 1783208926080.

The previous prime is 1980171948661. The next prime is 1980171948683. The reversal of 1980171948677 is 7768491710891.

It is a cyclic number.

It is not a de Polignac number, because 1980171948677 - 2⁴ = 1980171948661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980171948607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25228748 + ... + 25307114.

It is an arithmetic number, because the mean of its divisors is an integer number (136536177792).

Almost surely, 2^{1980171948677} is an apocalyptic number.

It is an amenable number.

1980171948677 is a deficient number, since it is larger than the sum of its proper divisors (204406895995).

1980171948677 is a wasteful number, since it uses less digits than its factorization.

1980171948677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125828.

The product of its (nonzero) digits is 42674688, while the sum is 68.

The spelling of 1980171948677 in words is "one trillion, nine hundred eighty billion, one hundred seventy-one million, nine hundred forty-eight thousand, six hundred seventy-seven".