1609735329561 has 8 divisors (see below), whose sum is σ = 2191980023424. Its totient is φ = 1050323761040.

The previous prime is 1609735329557. The next prime is 1609735329571. The reversal of 1609735329561 is 1659235379061.

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 1609735329561 - 2² = 1609735329557 is a prime.

It is a super-2 number, since 2×1609735329561² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1609735329511) 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, 5708281170 + ... + 5708281451.

It is an arithmetic number, because the mean of its divisors is an integer number (273997502928).

Almost surely, 2^{1609735329561} is an apocalyptic number.

It is an amenable number.

1609735329561 is a deficient number, since it is larger than the sum of its proper divisors (582244693863).

1609735329561 is a wasteful number, since it uses less digits than its factorization.

1609735329561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11416562671.

The product of its (nonzero) digits is 9185400, while the sum is 57.

The spelling of 1609735329561 in words is "one trillion, six hundred nine billion, seven hundred thirty-five million, three hundred twenty-nine thousand, five hundred sixty-one".