161788066563 has 16 divisors (see below), whose sum is σ = 224089689600. Its totient is φ = 103703701920.

The previous prime is 161788066541. The next prime is 161788066567. The reversal of 161788066563 is 365660887161.

It is a de Polignac number, because none of the positive numbers 2^k-161788066563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161788066567) 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, 3869653 + ... + 3911238.

It is an arithmetic number, because the mean of its divisors is an integer number (14005605600).

Almost surely, 2^161788066563 is an apocalyptic number.

161788066563 is a deficient number, since it is larger than the sum of its proper divisors (62301623037).

161788066563 is a wasteful number, since it uses less digits than its factorization.

161788066563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7781162.

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 161788066563 in words is "one hundred sixty-one billion, seven hundred eighty-eight million, sixty-six thousand, five hundred sixty-three".