61666125803 has 2 divisors, whose sum is σ = 61666125804. Its totient is φ = 61666125802.

The previous prime is 61666125797. The next prime is 61666125869. The reversal of 61666125803 is 30852166616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61666125803 - 2²⁴ = 61649348587 is a prime.

It is a super-2 number, since 2×61666125803² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61666125883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30833062901 + 30833062902.

It is an arithmetic number, because the mean of its divisors is an integer number (30833062902).

Almost surely, 2^61666125803 is an apocalyptic number.

61666125803 is a deficient number, since it is larger than the sum of its proper divisors (1).

61666125803 is an equidigital number, since it uses as much as digits as its factorization.

61666125803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 61666125803 in words is "sixty-one billion, six hundred sixty-six million, one hundred twenty-five thousand, eight hundred three".