161501670 has 96 divisors (see below), whose sum is σ = 470564640. Its totient is φ = 38085120.

The previous prime is 161501657. The next prime is 161501671. The reversal of 161501670 is 76105161.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161501671) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 34426 + ... + 38834.

It is an arithmetic number, because the mean of its divisors is an integer number (4901715).

Almost surely, 2^161501670 is an apocalyptic number.

161501670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161501670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235282320).

161501670 is an abundant number, since it is smaller than the sum of its proper divisors (309062970).

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

161501670 is a wasteful number, since it uses less digits than its factorization.

161501670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4470 (or 4467 counting only the distinct ones).

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

The square root of 161501670 is about 12708.3307322402. The cubic root of 161501670 is about 544.5766372359.

The spelling of 161501670 in words is "one hundred sixty-one million, five hundred one thousand, six hundred seventy".