161660601522 has 64 divisors (see below), whose sum is σ = 411236962560. Its totient is φ = 46113328512.

The previous prime is 161660601511. The next prime is 161660601569. The reversal of 161660601522 is 225106066161.

161660601522 is a `hidden beast` number, since 1 + 6 + 16 + 60 + 60 + 1 + 522 = 666.

It is a super-2 number, since 2×161660601522² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117123 + ... + 580550.

It is an arithmetic number, because the mean of its divisors is an integer number (6425577540).

Almost surely, 2^161660601522 is an apocalyptic number.

161660601522 is an abundant number, since it is smaller than the sum of its proper divisors (249576361038).

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

161660601522 is a wasteful number, since it uses less digits than its factorization.

161660601522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698304 (or 698298 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

Adding to 161660601522 its reverse (225106066161), we get a palindrome (386766667683).

The spelling of 161660601522 in words is "one hundred sixty-one billion, six hundred sixty million, six hundred one thousand, five hundred twenty-two".