201717121604 has 6 divisors (see below), whose sum is σ = 353004962814. Its totient is φ = 100858560800.

The previous prime is 201717121601. The next prime is 201717121633. The reversal of 201717121604 is 406121717102.

It can be written as a sum of positive squares in only one way, i.e., 139989719104 + 61727402500 = 374152^2 + 248450^2 .

It is not an unprimeable number, because it can be changed into a prime (201717121601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25214640197 + ... + 25214640204.

It is an arithmetic number, because the mean of its divisors is an integer number (58834160469).

Almost surely, 2^201717121604 is an apocalyptic number.

It is an amenable number.

201717121604 is a deficient number, since it is larger than the sum of its proper divisors (151287841210).

201717121604 is a wasteful number, since it uses less digits than its factorization.

201717121604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50429280405 (or 50429280403 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 32.

Adding to 201717121604 its reverse (406121717102), we get a palindrome (607838838706).

The spelling of 201717121604 in words is "two hundred one billion, seven hundred seventeen million, one hundred twenty-one thousand, six hundred four".