1601561653 has 8 divisors (see below), whose sum is σ = 1696547160. Its totient is φ = 1506662400.

The previous prime is 1601561641. The next prime is 1601561659. The reversal of 1601561653 is 3561651061.

It can be written as a sum of positive squares in 4 ways, for example, as 1158585444 + 442976209 = 34038^2 + 21047^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-1601561653 is a prime.

It is a super-3 number, since 3×1601561653³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601561659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18853 + ... + 59653.

It is an arithmetic number, because the mean of its divisors is an integer number (212068395).

Almost surely, 2^1601561653 is an apocalyptic number.

It is an amenable number.

1601561653 is a deficient number, since it is larger than the sum of its proper divisors (94985507).

1601561653 is a wasteful number, since it uses less digits than its factorization.

1601561653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43127.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 1601561653 is about 40019.5159016198. The cubic root of 1601561653 is about 1169.9874966399.

The spelling of 1601561653 in words is "one billion, six hundred one million, five hundred sixty-one thousand, six hundred fifty-three".