201686620625 has 20 divisors (see below), whose sum is σ = 288031550400. Its totient is φ = 138299394000.

The previous prime is 201686620601. The next prime is 201686620631. The reversal of 201686620625 is 526026686102.

It is not a de Polignac number, because 201686620625 - 2⁶ = 201686620561 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23045525 + ... + 23054274.

It is an arithmetic number, because the mean of its divisors is an integer number (14401577520).

Almost surely, 2^201686620625 is an apocalyptic number.

201686620625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

201686620625 is a deficient number, since it is larger than the sum of its proper divisors (86344929775).

201686620625 is an frugal number, since it uses more digits than its factorization.

201686620625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46099826 (or 46099811 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 201686620625 in words is "two hundred one billion, six hundred eighty-six million, six hundred twenty thousand, six hundred twenty-five".