161668695428 has 12 divisors (see below), whose sum is σ = 284261072592. Its totient is φ = 80451246120.

The previous prime is 161668695421. The next prime is 161668695431. The reversal of 161668695428 is 824596866161.

It is a super-2 number, since 2×161668695428² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161668695421) 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, 95774450 + ... + 95776137.

It is an arithmetic number, because the mean of its divisors is an integer number (23688422716).

Almost surely, 2^161668695428 is an apocalyptic number.

It is an amenable number.

161668695428 is a deficient number, since it is larger than the sum of its proper divisors (122592377164).

161668695428 is a wasteful number, since it uses less digits than its factorization.

161668695428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191550802 (or 191550800 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 62.

The spelling of 161668695428 in words is "one hundred sixty-one billion, six hundred sixty-eight million, six hundred ninety-five thousand, four hundred twenty-eight".