163952640999 has 20 divisors (see below), whose sum is σ = 279905038864. Its totient is φ = 93687223104.

The previous prime is 163952640989. The next prime is 163952641003. The reversal of 163952640999 is 999046259361.

163952640999 is a `hidden beast` number, since 1 + 63 + 9 + 526 + 40 + 9 + 9 + 9 = 666.

It is not a de Polignac number, because 163952640999 - 2⁵ = 163952640967 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163952640919) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 144578482 + ... + 144579615.

Almost surely, 2^163952640999 is an apocalyptic number.

163952640999 is a deficient number, since it is larger than the sum of its proper divisors (115952397865).

163952640999 is an equidigital number, since it uses as much as digits as its factorization.

163952640999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289158116 (or 289158107 counting only the distinct ones).

The product of its (nonzero) digits is 28343520, while the sum is 63.

The spelling of 163952640999 in words is "one hundred sixty-three billion, nine hundred fifty-two million, six hundred forty thousand, nine hundred ninety-nine".