160517978645761 has 9 divisors (see below), whose sum is σ = 176437270210593. Its totient is φ = 145925308436820.

The previous prime is 160517978645749. The next prime is 160517978645839. The reversal of 160517978645761 is 167546879715061.

It is a happy number.

The square root of 160517978645761 is 12669569.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 160517978645761 - 2²³ = 160517970257153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (160517978645461) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 138789370 + ... + 139941148.

Almost surely, 2^{160517978645761} is an apocalyptic number.

160517978645761 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

160517978645761 is the 12669569-th square number.

160517978645761 is the 6334785-th centered octagonal number.

It is an amenable number.

160517978645761 is a deficient number, since it is larger than the sum of its proper divisors (15919291564832).

160517978645761 is an frugal number, since it uses more digits than its factorization.

160517978645761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2303580 (or 1151790 counting only the distinct ones).

The product of its (nonzero) digits is 533433600, while the sum is 73.

The spelling of 160517978645761 in words is "one hundred sixty trillion, five hundred seventeen billion, nine hundred seventy-eight million, six hundred forty-five thousand, seven hundred sixty-one".