161551653 has 4 divisors (see below), whose sum is σ = 215402208. Its totient is φ = 107701100.

The previous prime is 161551651. The next prime is 161551667. The reversal of 161551653 is 356155161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161551653 - 2¹ = 161551651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161551651) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 26925273 + ... + 26925278.

It is an arithmetic number, because the mean of its divisors is an integer number (53850552).

Almost surely, 2^161551653 is an apocalyptic number.

It is an amenable number.

161551653 is a deficient number, since it is larger than the sum of its proper divisors (53850555).

161551653 is an equidigital number, since it uses as much as digits as its factorization.

161551653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53850554.

The product of its digits is 13500, while the sum is 33.

The square root of 161551653 is about 12710.2971247725. The cubic root of 161551653 is about 544.6328116116.

The spelling of 161551653 in words is "one hundred sixty-one million, five hundred fifty-one thousand, six hundred fifty-three".