20157176666644 has 12 divisors (see below), whose sum is σ = 36135426463668. Its totient is φ = 9832769105600.

The previous prime is 20157176666639. The next prime is 20157176666651. The reversal of 20157176666644 is 44666667175102.

It can be written as a sum of positive squares in 2 ways, for example, as 10507840896400 + 9649335770244 = 3241580^2 + 3106338^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61454806747 + ... + 61454807074.

It is an arithmetic number, because the mean of its divisors is an integer number (3011285538639).

Almost surely, 2^{20157176666644} is an apocalyptic number.

It is an amenable number.

20157176666644 is a deficient number, since it is larger than the sum of its proper divisors (15978249797024).

20157176666644 is a wasteful number, since it uses less digits than its factorization.

20157176666644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122909613866 (or 122909613864 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 61.

The spelling of 20157176666644 in words is "twenty trillion, one hundred fifty-seven billion, one hundred seventy-six million, six hundred sixty-six thousand, six hundred forty-four".