161605999999974 has 8 divisors (see below), whose sum is σ = 323211999999960. Its totient is φ = 53868666666656.

The previous prime is 161605999999933. The next prime is 161605999999979. The reversal of 161605999999974 is 479999999506161.

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

161605999999974 is an admirable number.

It is a super-2 number, since 2×161605999999974² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161605999999979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13467166666659 + ... + 13467166666670.

It is an arithmetic number, because the mean of its divisors is an integer number (40401499999995).

Almost surely, 2^{161605999999974} is an apocalyptic number.

161605999999974 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161605999999974 is a wasteful number, since it uses less digits than its factorization.

161605999999974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26934333333334.

The product of its (nonzero) digits is 24106163760, while the sum is 93.

The spelling of 161605999999974 in words is "one hundred sixty-one trillion, six hundred five billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-four".