1561610655165 has 32 divisors (see below), whose sum is σ = 2726790480000. Its totient is φ = 756847320320.

The previous prime is 1561610655113. The next prime is 1561610655167. The reversal of 1561610655165 is 5615560161651.

It is not a de Polignac number, because 1561610655165 - 2¹¹ = 1561610653117 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561610655167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1435890 + ... + 2277059.

It is an arithmetic number, because the mean of its divisors is an integer number (85212202500).

Almost surely, 2^{1561610655165} is an apocalyptic number.

1561610655165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561610655165 is a deficient number, since it is larger than the sum of its proper divisors (1165179824835).

1561610655165 is a wasteful number, since it uses less digits than its factorization.

1561610655165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3715517.

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 1561610655165 in words is "one trillion, five hundred sixty-one billion, six hundred ten million, six hundred fifty-five thousand, one hundred sixty-five".