161156655 has 64 divisors (see below), whose sum is σ = 319334400. Its totient is φ = 76440960.

The previous prime is 161156627. The next prime is 161156657. The reversal of 161156655 is 556651161.

It is not a de Polignac number, because 161156655 - 2⁸ = 161156399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161156657) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 68641 + ... + 70949.

It is an arithmetic number, because the mean of its divisors is an integer number (4989600).

Almost surely, 2^161156655 is an apocalyptic number.

161156655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161156655 is a deficient number, since it is larger than the sum of its proper divisors (158177745).

161156655 is a wasteful number, since it uses less digits than its factorization.

161156655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381 (or 2375 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 161156655 is about 12694.7491113452. The cubic root of 161156655 is about 544.1885688823.

It can be divided in two parts, 161 and 156655, that added together give a square (156816 = 396²).

The spelling of 161156655 in words is "one hundred sixty-one million, one hundred fifty-six thousand, six hundred fifty-five".