161620055 has 8 divisors (see below), whose sum is σ = 197603712. Its totient is φ = 126856288.

The previous prime is 161620021. The next prime is 161620087. The reversal of 161620055 is 550026161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161620055 is a prime.

It is a super-2 number, since 2×161620055² = 52242084356406050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 304679 + ... + 305208.

It is an arithmetic number, because the mean of its divisors is an integer number (24700464).

Almost surely, 2^161620055 is an apocalyptic number.

161620055 is a deficient number, since it is larger than the sum of its proper divisors (35983657).

161620055 is an equidigital number, since it uses as much as digits as its factorization.

161620055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609945.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 161620055 is about 12712.9876504306. The cubic root of 161620055 is about 544.7096677673.

The spelling of 161620055 in words is "one hundred sixty-one million, six hundred twenty thousand, fifty-five".