161262805501 has 16 divisors (see below), whose sum is σ = 194070175360. Its totient is φ = 130903128000.

The previous prime is 161262805481. The next prime is 161262805531. The reversal of 161262805501 is 105508262161.

It is a cyclic number.

It is not a de Polignac number, because 161262805501 - 2¹¹ = 161262803453 is a prime.

It is a super-2 number, since 2×161262805501² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161262805531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155251 + ... + 588751.

It is an arithmetic number, because the mean of its divisors is an integer number (12129385960).

Almost surely, 2^161262805501 is an apocalyptic number.

It is an amenable number.

161262805501 is a deficient number, since it is larger than the sum of its proper divisors (32807369859).

161262805501 is a wasteful number, since it uses less digits than its factorization.

161262805501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436324.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 161262805501 in words is "one hundred sixty-one billion, two hundred sixty-two million, eight hundred five thousand, five hundred one".