161754263545 has 32 divisors (see below), whose sum is σ = 222607881216. Its totient is φ = 110531174400.

The previous prime is 161754263497. The next prime is 161754263549. The reversal of 161754263545 is 545362457161.

It is a de Polignac number, because none of the positive numbers 2^k-161754263545 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (161754263549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12130672 + ... + 12143998.

It is an arithmetic number, because the mean of its divisors is an integer number (6956496288).

Almost surely, 2^161754263545 is an apocalyptic number.

It is an amenable number.

161754263545 is a deficient number, since it is larger than the sum of its proper divisors (60853617671).

161754263545 is a wasteful number, since it uses less digits than its factorization.

161754263545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14521.

The product of its digits is 3024000, while the sum is 49.

The spelling of 161754263545 in words is "one hundred sixty-one billion, seven hundred fifty-four million, two hundred sixty-three thousand, five hundred forty-five".