203523064404661 has 16 divisors (see below), whose sum is σ = 211121833512960. Its totient is φ = 195963161587200.

The previous prime is 203523064404659. The next prime is 203523064404731. The reversal of 203523064404661 is 166404460325302.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 203523064404661 - 2¹ = 203523064404659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203523064407661) 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, 74440261 + ... + 77125861.

It is an arithmetic number, because the mean of its divisors is an integer number (13195114594560).

Almost surely, 2^{203523064404661} is an apocalyptic number.

It is an amenable number.

203523064404661 is a deficient number, since it is larger than the sum of its proper divisors (7598769108299).

203523064404661 is a wasteful number, since it uses less digits than its factorization.

203523064404661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692836.

The product of its (nonzero) digits is 2488320, while the sum is 46.

The spelling of 203523064404661 in words is "two hundred three trillion, five hundred twenty-three billion, sixty-four million, four hundred four thousand, six hundred sixty-one".