201660112564 has 6 divisors (see below), whose sum is σ = 352905196994. Its totient is φ = 100830056280.

The previous prime is 201660112561. The next prime is 201660112567. The reversal of 201660112564 is 465211066102.

It is an interprime number because it is at equal distance from previous prime (201660112561) and next prime (201660112567).

It can be written as a sum of positive squares in only one way, i.e., 183946632100 + 17713480464 = 428890^2 + 133092^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201660112561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25207514067 + ... + 25207514074.

Almost surely, 2^201660112564 is an apocalyptic number.

It is an amenable number.

201660112564 is a deficient number, since it is larger than the sum of its proper divisors (151245084430).

201660112564 is a wasteful number, since it uses less digits than its factorization.

201660112564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50415028145 (or 50415028143 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

Adding to 201660112564 its reverse (465211066102), we get a palindrome (666871178666).

The spelling of 201660112564 in words is "two hundred one billion, six hundred sixty million, one hundred twelve thousand, five hundred sixty-four".