661600160001 has 24 divisors (see below), whose sum is σ = 1042549893216. Its totient is φ = 400958859840.

The previous prime is 661600159993. The next prime is 661600160021. The reversal of 661600160001 is 100061006166.

It is not a de Polignac number, because 661600160001 - 2³ = 661600159993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661600160021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4970746 + ... + 5102108.

It is an arithmetic number, because the mean of its divisors is an integer number (43439578884).

Almost surely, 2^661600160001 is an apocalyptic number.

It is an amenable number.

661600160001 is a deficient number, since it is larger than the sum of its proper divisors (380949733215).

661600160001 is a wasteful number, since it uses less digits than its factorization.

661600160001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182253 (or 182250 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

Adding to 661600160001 its reverse (100061006166), we get a palindrome (761661166167).

The spelling of 661600160001 in words is "six hundred sixty-one billion, six hundred million, one hundred sixty thousand, one".