161643976571632 has 80 divisors (see below), whose sum is σ = 344783954021760. Its totient is φ = 73071911112704.

The previous prime is 161643976571611. The next prime is 161643976571647. The reversal of 161643976571632 is 236175679346161.

It is a super-2 number, since 2×161643976571632² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50457208 + ... + 53565079.

It is an arithmetic number, because the mean of its divisors is an integer number (4309799425272).

Almost surely, 2^{161643976571632} is an apocalyptic number.

It is an amenable number.

161643976571632 is an abundant number, since it is smaller than the sum of its proper divisors (183139977450128).

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

161643976571632 is a wasteful number, since it uses less digits than its factorization.

161643976571632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104022538 (or 104022532 counting only the distinct ones).

The product of its digits is 205752960, while the sum is 67.

The spelling of 161643976571632 in words is "one hundred sixty-one trillion, six hundred forty-three billion, nine hundred seventy-six million, five hundred seventy-one thousand, six hundred thirty-two".