161743653 has 6 divisors (see below), whose sum is σ = 233629734. Its totient is φ = 107829096.

The previous prime is 161743639. The next prime is 161743657. The reversal of 161743653 is 356347161.

161743653 is a `hidden beast` number, since 1 + 617 + 4 + 36 + 5 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 115734564 + 46009089 = 10758^2 + 6783^2 .

It is not a de Polignac number, because 161743653 - 2²⁵ = 128189221 is a prime.

It is a super-2 number, since 2×161743653² = 52322018571568818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161743657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8985750 + ... + 8985767.

It is an arithmetic number, because the mean of its divisors is an integer number (38938289).

Almost surely, 2^161743653 is an apocalyptic number.

It is an amenable number.

161743653 is a deficient number, since it is larger than the sum of its proper divisors (71886081).

161743653 is a wasteful number, since it uses less digits than its factorization.

161743653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17971523 (or 17971520 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 161743653 is about 12717.8478132112. The cubic root of 161743653 is about 544.8484869063.

The spelling of 161743653 in words is "one hundred sixty-one million, seven hundred forty-three thousand, six hundred fifty-three".