161309255767 has 32 divisors (see below), whose sum is σ = 187745983488. Its totient is φ = 136968000000.

The previous prime is 161309255759. The next prime is 161309255803. The reversal of 161309255767 is 767552903161.

It is a cyclic number.

It is not a de Polignac number, because 161309255767 - 2³ = 161309255759 is a prime.

It is a super-2 number, since 2×161309255767² (a number of 23 digits) contains 22 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 (161309255167) 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, 36734142 + ... + 36738532.

It is an arithmetic number, because the mean of its divisors is an integer number (5867061984).

Almost surely, 2^161309255767 is an apocalyptic number.

161309255767 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

161309255767 is a deficient number, since it is larger than the sum of its proper divisors (26436727721).

161309255767 is a wasteful number, since it uses less digits than its factorization.

161309255767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5871.

The product of its (nonzero) digits is 2381400, while the sum is 52.

The spelling of 161309255767 in words is "one hundred sixty-one billion, three hundred nine million, two hundred fifty-five thousand, seven hundred sixty-seven".