20157176666643 has 16 divisors (see below), whose sum is σ = 27088764088320. Its totient is φ = 13331860579296.

The previous prime is 20157176666639. The next prime is 20157176666651. The reversal of 20157176666643 is 34666667175102.

It is not a de Polignac number, because 20157176666643 - 2² = 20157176666639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20157176666633) 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, 10740496 + ... + 12476882.

It is an arithmetic number, because the mean of its divisors is an integer number (1693047755520).

Almost surely, 2^{20157176666643} is an apocalyptic number.

20157176666643 is a deficient number, since it is larger than the sum of its proper divisors (6931587421677).

20157176666643 is a wasteful number, since it uses less digits than its factorization.

20157176666643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766986.

The product of its (nonzero) digits is 45722880, while the sum is 60.

The spelling of 20157176666643 in words is "twenty trillion, one hundred fifty-seven billion, one hundred seventy-six million, six hundred sixty-six thousand, six hundred forty-three".