163951902043 has 4 divisors (see below), whose sum is σ = 165927226248. Its totient is φ = 161976577840.

The previous prime is 163951902031. The next prime is 163951902073. The reversal of 163951902043 is 340209159361.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 163951902043 - 2²¹ = 163949804891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163951902073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 987661978 + ... + 987662143.

It is an arithmetic number, because the mean of its divisors is an integer number (41481806562).

Almost surely, 2^163951902043 is an apocalyptic number.

163951902043 is a deficient number, since it is larger than the sum of its proper divisors (1975324205).

163951902043 is an equidigital number, since it uses as much as digits as its factorization.

163951902043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975324204.

The product of its (nonzero) digits is 174960, while the sum is 43.

The spelling of 163951902043 in words is "one hundred sixty-three billion, nine hundred fifty-one million, nine hundred two thousand, forty-three".