201667001685 has 32 divisors (see below), whose sum is σ = 350881362432. Its totient is φ = 98493004800.

The previous prime is 201667001677. The next prime is 201667001717. The reversal of 201667001685 is 586100766102.

It is not a de Polignac number, because 201667001685 - 2³ = 201667001677 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10677741 + ... + 10696610.

It is an arithmetic number, because the mean of its divisors is an integer number (10965042576).

Almost surely, 2^201667001685 is an apocalyptic number.

It is an amenable number.

201667001685 is a deficient number, since it is larger than the sum of its proper divisors (149214360747).

201667001685 is a wasteful number, since it uses less digits than its factorization.

201667001685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21374413.

The product of its (nonzero) digits is 120960, while the sum is 42.

Adding to 201667001685 its reverse (586100766102), we get a palindrome (787767767787).

The spelling of 201667001685 in words is "two hundred one billion, six hundred sixty-seven million, one thousand, six hundred eighty-five".