161561070 has 48 divisors (see below), whose sum is σ = 458248752. Its totient is φ = 39166080.

The previous prime is 161561051. The next prime is 161561087. The reversal of 161561070 is 70165161.

It is a super-2 number, since 2×161561070² = 52203958679089800, which 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 23 ways as a sum of consecutive naturals, for example, 80607 + ... + 82586.

It is an arithmetic number, because the mean of its divisors is an integer number (9546849).

Almost surely, 2^161561070 is an apocalyptic number.

161561070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161561070 is an abundant number, since it is smaller than the sum of its proper divisors (296687682).

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

161561070 is a wasteful number, since it uses less digits than its factorization.

161561070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163217 (or 163214 counting only the distinct ones).

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

The square root of 161561070 is about 12710.6675670478. The cubic root of 161561070 is about 544.6433937948.

The spelling of 161561070 in words is "one hundred sixty-one million, five hundred sixty-one thousand, seventy".