661547203 has 2 divisors, whose sum is σ = 661547204. Its totient is φ = 661547202.

The previous prime is 661547167. The next prime is 661547207. The reversal of 661547203 is 302745166.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661547203 - 2²⁹ = 124676291 is a prime.

It is not a weakly prime, because it can be changed into another prime (661547207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330773601 + 330773602.

It is an arithmetic number, because the mean of its divisors is an integer number (330773602).

Almost surely, 2^661547203 is an apocalyptic number.

661547203 is a deficient number, since it is larger than the sum of its proper divisors (1).

661547203 is an equidigital number, since it uses as much as digits as its factorization.

661547203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 661547203 is about 25720.5599278087. The cubic root of 661547203 is about 871.3385845690.

The spelling of 661547203 in words is "six hundred sixty-one million, five hundred forty-seven thousand, two hundred three".