161616705515 has 8 divisors (see below), whose sum is σ = 193942482720. Its totient is φ = 129291740352.

The previous prime is 161616705511. The next prime is 161616705577. The reversal of 161616705515 is 515507616161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161616705515 - 2² = 161616705511 is a prime.

It is a super-2 number, since 2×161616705515² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161616705511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394991 + ... + 692279.

It is an arithmetic number, because the mean of its divisors is an integer number (24242810340).

Almost surely, 2^161616705515 is an apocalyptic number.

161616705515 is a deficient number, since it is larger than the sum of its proper divisors (32325777205).

161616705515 is a wasteful number, since it uses less digits than its factorization.

161616705515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406021.

The product of its (nonzero) digits is 189000, while the sum is 44.

The spelling of 161616705515 in words is "one hundred sixty-one billion, six hundred sixteen million, seven hundred five thousand, five hundred fifteen".