161506785 has 32 divisors (see below), whose sum is σ = 283299840. Its totient is φ = 77918400.

The previous prime is 161506729. The next prime is 161506799. The reversal of 161506785 is 587605161.

It is not a de Polignac number, because 161506785 - 2¹⁴ = 161490401 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32496 + ... + 37134.

It is an arithmetic number, because the mean of its divisors is an integer number (8853120).

Almost surely, 2^161506785 is an apocalyptic number.

161506785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161506785 is a deficient number, since it is larger than the sum of its proper divisors (121793055).

161506785 is a wasteful number, since it uses less digits than its factorization.

161506785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4869.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 161506785 is about 12708.5319765896. The cubic root of 161506785 is about 544.5823863614.

The spelling of 161506785 in words is "one hundred sixty-one million, five hundred six thousand, seven hundred eighty-five".