203661452551 has 2 divisors, whose sum is σ = 203661452552. Its totient is φ = 203661452550.

The previous prime is 203661452513. The next prime is 203661452651. The reversal of 203661452551 is 155254166302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 203661452551 - 2¹³ = 203661444359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203661452651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101830726275 + 101830726276.

It is an arithmetic number, because the mean of its divisors is an integer number (101830726276).

Almost surely, 2^203661452551 is an apocalyptic number.

203661452551 is a deficient number, since it is larger than the sum of its proper divisors (1).

203661452551 is an equidigital number, since it uses as much as digits as its factorization.

203661452551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 203661452551 in words is "two hundred three billion, six hundred sixty-one million, four hundred fifty-two thousand, five hundred fifty-one".