161688968017706 has 16 divisors (see below), whose sum is σ = 243830924147016. Its totient is φ = 80413109408256.

The previous prime is 161688968017663. The next prime is 161688968017751. The reversal of 161688968017706 is 607710869886161.

It can be written as a sum of positive squares in 4 ways, for example, as 112885121317081 + 48803846700625 = 10624741^2 + 6985975^2 .

It is a super-2 number, since 2×161688968017706² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278736431 + ... + 279315906.

Almost surely, 2^{161688968017706} is an apocalyptic number.

161688968017706 is a deficient number, since it is larger than the sum of its proper divisors (82141956129310).

161688968017706 is a wasteful number, since it uses less digits than its factorization.

161688968017706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558053113.

The product of its (nonzero) digits is 292626432, while the sum is 74.

The spelling of 161688968017706 in words is "one hundred sixty-one trillion, six hundred eighty-eight billion, nine hundred sixty-eight million, seventeen thousand, seven hundred six".