161647575642 has 160 divisors (see below), whose sum is σ = 420674601600. Its totient is φ = 45441233280.

The previous prime is 161647575637. The next prime is 161647575643. The reversal of 161647575642 is 246575746161.

161647575642 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 4 + 7 + 575 + 64 + 2 = 666.

It is a super-2 number, since 2×161647575642² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (161647575643) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 18074892 + ... + 18083832.

It is an arithmetic number, because the mean of its divisors is an integer number (2629216260).

Almost surely, 2^161647575642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161647575642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210337300800).

161647575642 is an abundant number, since it is smaller than the sum of its proper divisors (259027025958).

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

161647575642 is a wasteful number, since it uses less digits than its factorization.

161647575642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9218 (or 9209 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 54.

The spelling of 161647575642 in words is "one hundred sixty-one billion, six hundred forty-seven million, five hundred seventy-five thousand, six hundred forty-two".