161671562720 has 24 divisors (see below), whose sum is σ = 381949067304. Its totient is φ = 64668625024.

The previous prime is 161671562639. The next prime is 161671562743. The reversal of 161671562720 is 27265176161.

It is a super-2 number, since 2×161671562720² (a number of 23 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 3 ways as a sum of consecutive naturals, for example, 505223474 + ... + 505223793.

It is an arithmetic number, because the mean of its divisors is an integer number (15914544471).

Almost surely, 2^161671562720 is an apocalyptic number.

161671562720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161671562720 is an abundant number, since it is smaller than the sum of its proper divisors (220277504584).

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

161671562720 is a wasteful number, since it uses less digits than its factorization.

161671562720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010447282 (or 1010447274 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 161671562720 in words is "one hundred sixty-one billion, six hundred seventy-one million, five hundred sixty-two thousand, seven hundred twenty".