203443301661 has 16 divisors (see below), whose sum is σ = 271717010880. Its totient is φ = 135399329280.

The previous prime is 203443301657. The next prime is 203443301671. The reversal of 203443301661 is 166103344302.

It is not a de Polignac number, because 203443301661 - 2² = 203443301657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203443301641) 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, 10747341 + ... + 10766253.

It is an arithmetic number, because the mean of its divisors is an integer number (16982313180).

Almost surely, 2^203443301661 is an apocalyptic number.

It is an amenable number.

203443301661 is a deficient number, since it is larger than the sum of its proper divisors (68273709219).

203443301661 is a wasteful number, since it uses less digits than its factorization.

203443301661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24796.

The product of its (nonzero) digits is 31104, while the sum is 33.

Adding to 203443301661 its reverse (166103344302), we get a palindrome (369546645963).

The spelling of 203443301661 in words is "two hundred three billion, four hundred forty-three million, three hundred one thousand, six hundred sixty-one".