161511502112701 has 4 divisors (see below), whose sum is σ = 173935463813692. Its totient is φ = 149087540411712.

The previous prime is 161511502112699. The next prime is 161511502112717. The reversal of 161511502112701 is 107211205115161.

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

It can be written as a sum of positive squares in 2 ways, for example, as 57492941408100 + 104018560704601 = 7582410^2 + 10198949^2 .

It is a cyclic number.

It is not a de Polignac number, because 161511502112701 - 2¹ = 161511502112699 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161511502112771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6211980850476 + ... + 6211980850501.

It is an arithmetic number, because the mean of its divisors is an integer number (43483865953423).

Almost surely, 2^{161511502112701} is an apocalyptic number.

It is an amenable number.

161511502112701 is a deficient number, since it is larger than the sum of its proper divisors (12423961700991).

161511502112701 is a wasteful number, since it uses less digits than its factorization.

161511502112701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12423961700990.

The product of its (nonzero) digits is 4200, while the sum is 34.

Adding to 161511502112701 its reverse (107211205115161), we get a palindrome (268722707227862).

The spelling of 161511502112701 in words is "one hundred sixty-one trillion, five hundred eleven billion, five hundred two million, one hundred twelve thousand, seven hundred one".