161520111071051 has 4 divisors (see below), whose sum is σ = 161615178825000. Its totient is φ = 161425043317104.

The previous prime is 161520111071041. The next prime is 161520111071087. The reversal of 161520111071051 is 150170111025161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161520111071051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161520111070999 and 161520111071017.

It is not an unprimeable number, because it can be changed into a prime (161520111071041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47533874426 + ... + 47533877823.

It is an arithmetic number, because the mean of its divisors is an integer number (40403794706250).

Almost surely, 2^{161520111071051} is an apocalyptic number.

161520111071051 is a deficient number, since it is larger than the sum of its proper divisors (95067753949).

161520111071051 is an equidigital number, since it uses as much as digits as its factorization.

161520111071051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95067753948.

The product of its (nonzero) digits is 2100, while the sum is 32.

The spelling of 161520111071051 in words is "one hundred sixty-one trillion, five hundred twenty billion, one hundred eleven million, seventy-one thousand, fifty-one".