211557885705 has 12 divisors (see below), whose sum is σ = 366700335300. Its totient is φ = 112830872352.

The previous prime is 211557885683. The next prime is 211557885757. The reversal of 211557885705 is 507588755112.

211557885705 is a `hidden beast` number, since 2 + 1 + 1 + 557 + 8 + 85 + 7 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34017006969 + 177540878736 = 184437^2 + 421356^2 .

It is not a de Polignac number, because 211557885705 - 2⁵ = 211557885673 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2350643130 + ... + 2350643219.

It is an arithmetic number, because the mean of its divisors is an integer number (30558361275).

Almost surely, 2^211557885705 is an apocalyptic number.

It is an amenable number.

211557885705 is a deficient number, since it is larger than the sum of its proper divisors (155142449595).

211557885705 is a wasteful number, since it uses less digits than its factorization.

211557885705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4701286360 (or 4701286357 counting only the distinct ones).

The product of its (nonzero) digits is 3920000, while the sum is 54.

The spelling of 211557885705 in words is "two hundred eleven billion, five hundred fifty-seven million, eight hundred eighty-five thousand, seven hundred five".