161665555467 has 32 divisors (see below), whose sum is σ = 234603109440. Its totient is φ = 98429460480.

The previous prime is 161665555463. The next prime is 161665555507. The reversal of 161665555467 is 764555566161.

It is not a de Polignac number, because 161665555467 - 2² = 161665555463 is a prime.

It is a super-2 number, since 2×161665555467² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161665555463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18490717 + ... + 18499457.

It is an arithmetic number, because the mean of its divisors is an integer number (7331347170).

Almost surely, 2^161665555467 is an apocalyptic number.

161665555467 is a deficient number, since it is larger than the sum of its proper divisors (72937553973).

161665555467 is a wasteful number, since it uses less digits than its factorization.

161665555467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13743.

The product of its digits is 22680000, while the sum is 57.

The spelling of 161665555467 in words is "one hundred sixty-one billion, six hundred sixty-five million, five hundred fifty-five thousand, four hundred sixty-seven".