156106161099981 has 6 divisors (see below), whose sum is σ = 225486677144430. Its totient is φ = 104070774066648.

The previous prime is 156106161099953. The next prime is 156106161100037. The reversal of 156106161099981 is 189990161601651.

156106161099981 is a `hidden beast` number, since 1 + 5 + 6 + 1 + 0 + 6 + 1 + 610 + 9 + 9 + 9 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 87393517402500 + 68712643697481 = 9348450^2 + 8289309^2 .

It is not a de Polignac number, because 156106161099981 - 2⁷ = 156106161099853 is a prime.

It is a super-3 number, since 3×156106161099981³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156106161099901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8672564505546 + ... + 8672564505563.

It is an arithmetic number, because the mean of its divisors is an integer number (37581112857405).

Almost surely, 2^{156106161099981} is an apocalyptic number.

It is an amenable number.

156106161099981 is a deficient number, since it is larger than the sum of its proper divisors (69380516044449).

156106161099981 is a wasteful number, since it uses less digits than its factorization.

156106161099981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17345129011115 (or 17345129011112 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 63.

The spelling of 156106161099981 in words is "one hundred fifty-six trillion, one hundred six billion, one hundred sixty-one million, ninety-nine thousand, nine hundred eighty-one".