201403257666 has 16 divisors (see below), whose sum is σ = 433791632064. Its totient is φ = 61970233104.

The previous prime is 201403257623. The next prime is 201403257703. The reversal of 201403257666 is 666752304102.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1291046446 + ... + 1291046601.

It is an arithmetic number, because the mean of its divisors is an integer number (27111977004).

Almost surely, 2^201403257666 is an apocalyptic number.

201403257666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

201403257666 is an abundant number, since it is smaller than the sum of its proper divisors (232388374398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201403257666 is a wasteful number, since it uses less digits than its factorization.

201403257666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582093065.

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 201403257666 in words is "two hundred one billion, four hundred three million, two hundred fifty-seven thousand, six hundred sixty-six".