213157726686 has 16 divisors (see below), whose sum is σ = 473683837200. Its totient is φ = 71052575544.

The previous prime is 213157726657. The next prime is 213157726687. The reversal of 213157726686 is 686627751312.

213157726686 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 577 + 2 + 6 + 68 + 6 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 3947365309 = 213157726686 / (2 + 1 + 3 + 1 + 5 + 7 + 7 + 2 + 6 + 6 + 8 + 6).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213157726687) 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, 1973682601 + ... + 1973682708.

It is an arithmetic number, because the mean of its divisors is an integer number (29605239825).

Almost surely, 2^213157726686 is an apocalyptic number.

213157726686 is an abundant number, since it is smaller than the sum of its proper divisors (260526110514).

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

213157726686 is a wasteful number, since it uses less digits than its factorization.

213157726686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3947365320 (or 3947365314 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 213157726686 in words is "two hundred thirteen billion, one hundred fifty-seven million, seven hundred twenty-six thousand, six hundred eighty-six".