161510656 has 18 divisors (see below), whose sum is σ = 322390922. Its totient is φ = 80755200.

The previous prime is 161510653. The next prime is 161510689. The reversal of 161510656 is 656015161.

It can be written as a sum of positive squares in only one way, i.e., 153760000 + 7750656 = 12400^2 + 2784^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161510653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315195 + ... + 315706.

Almost surely, 2^161510656 is an apocalyptic number.

161510656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161510656 is a deficient number, since it is larger than the sum of its proper divisors (160880266).

161510656 is an frugal number, since it uses more digits than its factorization.

161510656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630917 (or 630903 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 161510656 is about 12708.6842749358. The cubic root of 161510656 is about 544.5867371829.

The spelling of 161510656 in words is "one hundred sixty-one million, five hundred ten thousand, six hundred fifty-six".