161571312000 has 768 divisors, whose sum is σ = 670958121600. Its totient is φ = 36495360000.

The previous prime is 161571311981. The next prime is 161571312053. The reversal of 161571312000 is 213175161.

161571312000 is a `hidden beast` number, since 1 + 61 + 571 + 31 + 2 + 0 + 0 + 0 = 666.

It is a super-2 number, since 2×161571312000² (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 95 ways as a sum of consecutive naturals, for example, 89711100 + ... + 89712900.

Almost surely, 2^161571312000 is an apocalyptic number.

161571312000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161571312000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335479060800).

161571312000 is an abundant number, since it is smaller than the sum of its proper divisors (509386809600).

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

161571312000 is a wasteful number, since it uses less digits than its factorization.

161571312000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932 (or 1907 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

Adding to 161571312000 its reverse (213175161), we get a palindrome (161784487161).

The spelling of 161571312000 in words is "one hundred sixty-one billion, five hundred seventy-one million, three hundred twelve thousand".