61660390403 has 2 divisors, whose sum is σ = 61660390404. Its totient is φ = 61660390402.

The previous prime is 61660390399. The next prime is 61660390487. The reversal of 61660390403 is 30409306616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61660390403 - 2² = 61660390399 is a prime.

It is not a weakly prime, because it can be changed into another prime (61660392403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30830195201 + 30830195202.

It is an arithmetic number, because the mean of its divisors is an integer number (30830195202).

Almost surely, 2^61660390403 is an apocalyptic number.

61660390403 is a deficient number, since it is larger than the sum of its proper divisors (1).

61660390403 is an equidigital number, since it uses as much as digits as its factorization.

61660390403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 38.

The spelling of 61660390403 in words is "sixty-one billion, six hundred sixty million, three hundred ninety thousand, four hundred three".