161745747 has 16 divisors (see below), whose sum is σ = 221071488. Its totient is φ = 105134400.

The previous prime is 161745737. The next prime is 161745751. The reversal of 161745747 is 747547161.

It is not a de Polignac number, because 161745747 - 2¹⁴ = 161729363 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161745699 and 161745708.

It is not an unprimeable number, because it can be changed into a prime (161745707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134983 + ... + 136175.

It is an arithmetic number, because the mean of its divisors is an integer number (13816968).

Almost surely, 2^161745747 is an apocalyptic number.

161745747 is a deficient number, since it is larger than the sum of its proper divisors (59325741).

161745747 is a wasteful number, since it uses less digits than its factorization.

161745747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290.

The product of its digits is 164640, while the sum is 42.

The square root of 161745747 is about 12717.9301381947. The cubic root of 161745747 is about 544.8508381739.

The spelling of 161745747 in words is "one hundred sixty-one million, seven hundred forty-five thousand, seven hundred forty-seven".