161695770 has 32 divisors (see below), whose sum is σ = 388523520. Its totient is φ = 43068480.

The previous prime is 161695753. The next prime is 161695771. The reversal of 161695770 is 77596161.

It is a super-2 number, since 2×161695770² = 52291044071785800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161695771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27991 + ... + 33269.

It is an arithmetic number, because the mean of its divisors is an integer number (12141360).

Almost surely, 2^161695770 is an apocalyptic number.

161695770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161695770 is an abundant number, since it is smaller than the sum of its proper divisors (226827750).

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

161695770 is a wasteful number, since it uses less digits than its factorization.

161695770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6310.

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 161695770 is about 12715.9651619529. The cubic root of 161695770 is about 544.7947154919.

The spelling of 161695770 in words is "one hundred sixty-one million, six hundred ninety-five thousand, seven hundred seventy".