203406012231656 has 32 divisors (see below), whose sum is σ = 410765672591400. Its totient is φ = 93870099313920.

The previous prime is 203406012231619. The next prime is 203406012231733. The reversal of 203406012231656 is 656132210604302.

It can be written as a sum of positive squares in 4 ways, for example, as 130648694787556 + 72757317444100 = 11430166^2 + 8529790^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98963711 + ... + 100998158.

Almost surely, 2^{203406012231656} is an apocalyptic number.

203406012231656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

203406012231656 is an abundant number, since it is smaller than the sum of its proper divisors (207359660359744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

203406012231656 is a wasteful number, since it uses less digits than its factorization.

203406012231656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199971669 (or 199971665 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

Adding to 203406012231656 its reverse (656132210604302), we get a palindrome (859538222835958).

The spelling of 203406012231656 in words is "two hundred three trillion, four hundred six billion, twelve million, two hundred thirty-one thousand, six hundred fifty-six".