161690702 has 4 divisors (see below), whose sum is σ = 242536056. Its totient is φ = 80845350.

The previous prime is 161690701. The next prime is 161690731. The reversal of 161690702 is 207096161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×161690702² = 52287766226505608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161690701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40422674 + ... + 40422677.

It is an arithmetic number, because the mean of its divisors is an integer number (60634014).

Almost surely, 2^161690702 is an apocalyptic number.

161690702 is a deficient number, since it is larger than the sum of its proper divisors (80845354).

161690702 is an equidigital number, since it uses as much as digits as its factorization.

161690702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80845353.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 161690702 is about 12715.7658833434. The cubic root of 161690702 is about 544.7890236331.

The spelling of 161690702 in words is "one hundred sixty-one million, six hundred ninety thousand, seven hundred two".