161677542 has 16 divisors (see below), whose sum is σ = 348228720. Its totient is φ = 49746912.

The previous prime is 161677541. The next prime is 161677561. The reversal of 161677542 is 245776161.

It is a super-2 number, since 2×161677542² = 52279255174323528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 161677542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161677541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1036317 + ... + 1036472.

It is an arithmetic number, because the mean of its divisors is an integer number (21764295).

Almost surely, 2^161677542 is an apocalyptic number.

161677542 is an abundant number, since it is smaller than the sum of its proper divisors (186551178).

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

161677542 is a wasteful number, since it uses less digits than its factorization.

161677542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072807.

The product of its digits is 70560, while the sum is 39.

The square root of 161677542 is about 12715.2484049664. The cubic root of 161677542 is about 544.7742431129.

The spelling of 161677542 in words is "one hundred sixty-one million, six hundred seventy-seven thousand, five hundred forty-two".