661610401307047 has 2 divisors, whose sum is σ = 661610401307048. Its totient is φ = 661610401307046.

The previous prime is 661610401307039. The next prime is 661610401307071. The reversal of 661610401307047 is 740703104016166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661610401307047 - 2³ = 661610401307039 is a prime.

It is a super-3 number, since 3×661610401307047³ (a number of 45 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 661610401306988 and 661610401307006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661610401307347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330805200653523 + 330805200653524.

It is an arithmetic number, because the mean of its divisors is an integer number (330805200653524).

Almost surely, 2^{661610401307047} is an apocalyptic number.

661610401307047 is a deficient number, since it is larger than the sum of its proper divisors (1).

661610401307047 is an equidigital number, since it uses as much as digits as its factorization.

661610401307047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 661610401307047 in words is "six hundred sixty-one trillion, six hundred ten billion, four hundred one million, three hundred seven thousand, forty-seven".