161554423003 has 8 divisors (see below), whose sum is σ = 164998900800. Its totient is φ = 158110243200.

The previous prime is 161554422989. The next prime is 161554423057. The reversal of 161554423003 is 300324455161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161554423003 - 2⁵ = 161554422971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161554423003.

It is not an unprimeable number, because it can be changed into a prime (161554427003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1281603 + ... + 1402003.

It is an arithmetic number, because the mean of its divisors is an integer number (20624862600).

Almost surely, 2^161554423003 is an apocalyptic number.

161554423003 is a deficient number, since it is larger than the sum of its proper divisors (3444477797).

161554423003 is a wasteful number, since it uses less digits than its factorization.

161554423003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148997.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 161554423003 its reverse (300324455161), we get a palindrome (461878878164).

The spelling of 161554423003 in words is "one hundred sixty-one billion, five hundred fifty-four million, four hundred twenty-three thousand, three".