161605277016 has 64 divisors (see below), whose sum is σ = 425672133120. Its totient is φ = 51026046720.

The previous prime is 161605276997. The next prime is 161605277021. The reversal of 161605277016 is 610772506161.

It is a super-2 number, since 2×161605277016² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1364325 + ... + 1478036.

It is an arithmetic number, because the mean of its divisors is an integer number (6651127080).

Almost surely, 2^161605277016 is an apocalyptic number.

It is an amenable number.

161605277016 is an abundant number, since it is smaller than the sum of its proper divisors (264066856104).

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

161605277016 is a wasteful number, since it uses less digits than its factorization.

161605277016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842496 (or 2842492 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 42.

The spelling of 161605277016 in words is "one hundred sixty-one billion, six hundred five million, two hundred seventy-seven thousand, sixteen".