161606100616661 has 8 divisors (see below), whose sum is σ = 161931290421600. Its totient is φ = 161281237474480.

The previous prime is 161606100616633. The next prime is 161606100616787. The reversal of 161606100616661 is 166616001606161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161606100616661 is a prime.

It is a super-2 number, since 2×161606100616661² (a number of 29 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 (161606100616561) 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, 80675246 + ... + 82654143.

It is an arithmetic number, because the mean of its divisors is an integer number (20241411302700).

Almost surely, 2^{161606100616661} is an apocalyptic number.

It is an amenable number.

161606100616661 is a deficient number, since it is larger than the sum of its proper divisors (325189804939).

161606100616661 is a wasteful number, since it uses less digits than its factorization.

161606100616661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163331379.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 161606100616661 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred million, six hundred sixteen thousand, six hundred sixty-one".