161611160561511 has 16 divisors (see below), whose sum is σ = 227763854461440. Its totient is φ = 101646678833280.

The previous prime is 161611160561497. The next prime is 161611160561581. The reversal of 161611160561511 is 115165061116161.

It is not a de Polignac number, because 161611160561511 - 2⁶ = 161611160561447 is a prime.

It is a super-2 number, since 2×161611160561511² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161611160561581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5882317215 + ... + 5882344688.

It is an arithmetic number, because the mean of its divisors is an integer number (14235240903840).

Almost surely, 2^{161611160561511} is an apocalyptic number.

161611160561511 is a deficient number, since it is larger than the sum of its proper divisors (66152693899929).

161611160561511 is a wasteful number, since it uses less digits than its factorization.

161611160561511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11764662166.

The product of its (nonzero) digits is 32400, while the sum is 42.

The spelling of 161611160561511 in words is "one hundred sixty-one trillion, six hundred eleven billion, one hundred sixty million, five hundred sixty-one thousand, five hundred eleven".