161505115106580 has 72 divisors (see below), whose sum is σ = 559884399040512. Its totient is φ = 36915454881216.

The previous prime is 161505115106497. The next prime is 161505115106639. The reversal of 161505115106580 is 85601511505161.

161505115106580 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 0 + 5 + 11 + 51 + 0 + 6 + 580 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64089330132 + ... + 64089332651.

It is an arithmetic number, because the mean of its divisors is an integer number (7776172208896).

Almost surely, 2^{161505115106580} is an apocalyptic number.

161505115106580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161505115106580 is an abundant number, since it is smaller than the sum of its proper divisors (398379283933932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161505115106580 is a wasteful number, since it uses less digits than its factorization.

161505115106580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128178662805 (or 128178662800 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 45.

The spelling of 161505115106580 in words is "one hundred sixty-one trillion, five hundred five billion, one hundred fifteen million, one hundred six thousand, five hundred eighty".