155065600505981 has 8 divisors (see below), whose sum is σ = 169162570200000. Its totient is φ = 140968646965440.

The previous prime is 155065600505899. The next prime is 155065600505993. The reversal of 155065600505981 is 189505006560551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155065600505981 is a prime.

It is a super-2 number, since 2×155065600505981² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155065600505281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25301000 + ... + 30826478.

It is an arithmetic number, because the mean of its divisors is an integer number (21145321275000).

Almost surely, 2^{155065600505981} is an apocalyptic number.

155065600505981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155065600505981 is a deficient number, since it is larger than the sum of its proper divisors (14096969694019).

155065600505981 is a wasteful number, since it uses less digits than its factorization.

155065600505981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8076739.

The product of its (nonzero) digits is 8100000, while the sum is 56.

The spelling of 155065600505981 in words is "one hundred fifty-five trillion, sixty-five billion, six hundred million, five hundred five thousand, nine hundred eighty-one".