161385555 has 8 divisors (see below), whose sum is σ = 258216912. Its totient is φ = 86072288.

The previous prime is 161385547. The next prime is 161385559. The reversal of 161385555 is 555583161.

161385555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161385555 - 2³ = 161385547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161385559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5379504 + ... + 5379533.

It is an arithmetic number, because the mean of its divisors is an integer number (32277114).

Almost surely, 2^161385555 is an apocalyptic number.

161385555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161385555 is a deficient number, since it is larger than the sum of its proper divisors (96831357).

161385555 is a wasteful number, since it uses less digits than its factorization.

161385555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10759045.

The product of its digits is 90000, while the sum is 39.

The square root of 161385555 is about 12703.7614508460. The cubic root of 161385555 is about 544.4460943615.

The spelling of 161385555 in words is "one hundred sixty-one million, three hundred eighty-five thousand, five hundred fifty-five".