161606155016644 has 24 divisors (see below), whose sum is σ = 304603135863768. Its totient is φ = 74578225989120.

The previous prime is 161606155016611. The next prime is 161606155016651. The reversal of 161606155016644 is 446610551606161.

It can be written as a sum of positive squares in 4 ways, for example, as 1459964724100 + 160146190292544 = 1208290^2 + 12654888^2 .

It is a super-2 number, since 2×161606155016644² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a junction number, because it is equal to n+sod(n) for n = 161606155016591 and 161606155016600.

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, 191871007 + ... + 192711430.

It is an arithmetic number, because the mean of its divisors is an integer number (12691797327657).

Almost surely, 2^{161606155016644} is an apocalyptic number.

It is an amenable number.

161606155016644 is a deficient number, since it is larger than the sum of its proper divisors (142996980847124).

161606155016644 is a wasteful number, since it uses less digits than its factorization.

161606155016644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384590535 (or 384590533 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 161606155016644 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred fifty-five million, sixteen thousand, six hundred forty-four".