161645361648 has 40 divisors (see below), whose sum is σ = 418685702400. Its totient is φ = 53739612864.

The previous prime is 161645361641. The next prime is 161645361649. The reversal of 161645361648 is 846163546161.

It is a super-2 number, since 2×161645361648² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161645361648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161645361641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4424568 + ... + 4460951.

It is an arithmetic number, because the mean of its divisors is an integer number (10467142560).

Almost surely, 2^161645361648 is an apocalyptic number.

It is an amenable number.

161645361648 is an abundant number, since it is smaller than the sum of its proper divisors (257040340752).

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

161645361648 is a wasteful number, since it uses less digits than its factorization.

161645361648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8885909 (or 8885903 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 51.

The spelling of 161645361648 in words is "one hundred sixty-one billion, six hundred forty-five million, three hundred sixty-one thousand, six hundred forty-eight".