161542621503011 has 24 divisors (see below), whose sum is σ = 189451399527936. Its totient is φ = 137335071283200.

The previous prime is 161542621503007. The next prime is 161542621503071. The reversal of 161542621503011 is 110305126245161.

It is not a de Polignac number, because 161542621503011 - 2² = 161542621503007 is a prime.

It is a super-2 number, since 2×161542621503011² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161542621503071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17758361 + ... + 25267461.

It is an arithmetic number, because the mean of its divisors is an integer number (7893808313664).

Almost surely, 2^{161542621503011} is an apocalyptic number.

161542621503011 is a deficient number, since it is larger than the sum of its proper divisors (27908778024925).

161542621503011 is a wasteful number, since it uses less digits than its factorization.

161542621503011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7512699 (or 7512692 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

Adding to 161542621503011 its reverse (110305126245161), we get a palindrome (271847747748172).

The spelling of 161542621503011 in words is "one hundred sixty-one trillion, five hundred forty-two billion, six hundred twenty-one million, five hundred three thousand, eleven".