201668353685 has 16 divisors (see below), whose sum is σ = 246102133872. Its totient is φ = 158604134400.

The previous prime is 201668353657. The next prime is 201668353687. The reversal of 201668353685 is 586353866102.

It can be written as a sum of positive squares in 8 ways, for example, as 26602262404 + 175066091281 = 163102^2 + 418409^2 .

It is not a de Polignac number, because 201668353685 - 2⁸ = 201668353429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201668353687) 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, 389957 + ... + 745253.

It is an arithmetic number, because the mean of its divisors is an integer number (15381383367).

Almost surely, 2^201668353685 is an apocalyptic number.

It is an amenable number.

201668353685 is a deficient number, since it is larger than the sum of its proper divisors (44433780187).

201668353685 is a wasteful number, since it uses less digits than its factorization.

201668353685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357224.

The product of its (nonzero) digits is 6220800, while the sum is 53.

The spelling of 201668353685 in words is "two hundred one billion, six hundred sixty-eight million, three hundred fifty-three thousand, six hundred eighty-five".