213711187657 has 16 divisors (see below), whose sum is σ = 233769473280. Its totient is φ = 193758364800.

The previous prime is 213711187637. The next prime is 213711187681. The reversal of 213711187657 is 756781117312.

It is a de Polignac number, because none of the positive numbers 2^k-213711187657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213711187657.

It is not an unprimeable number, because it can be changed into a prime (213711187607) 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, 10323357 + ... + 10344037.

It is an arithmetic number, because the mean of its divisors is an integer number (14610592080).

Almost surely, 2^213711187657 is an apocalyptic number.

It is an amenable number.

213711187657 is a deficient number, since it is larger than the sum of its proper divisors (20058285623).

213711187657 is a wasteful number, since it uses less digits than its factorization.

213711187657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23184.

The product of its digits is 493920, while the sum is 49.

The spelling of 213711187657 in words is "two hundred thirteen billion, seven hundred eleven million, one hundred eighty-seven thousand, six hundred fifty-seven".