1561606355 has 8 divisors (see below), whose sum is σ = 1938546000. Its totient is φ = 1206206176.

The previous prime is 1561606301. The next prime is 1561606379. The reversal of 1561606355 is 5536061651.

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 1561606355 - 2²⁶ = 1494497491 is a prime.

It is a super-2 number, since 2×1561606355² = 4877228815952772050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5384705 + ... + 5384994.

It is an arithmetic number, because the mean of its divisors is an integer number (242318250).

Almost surely, 2^1561606355 is an apocalyptic number.

1561606355 is a deficient number, since it is larger than the sum of its proper divisors (376939645).

1561606355 is a wasteful number, since it uses less digits than its factorization.

1561606355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10769733.

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 1561606355 is about 39517.1653209083. The cubic root of 1561606355 is about 1160.1759431400.

The spelling of 1561606355 in words is "one billion, five hundred sixty-one million, six hundred six thousand, three hundred fifty-five".