61660323533 has 2 divisors, whose sum is σ = 61660323534. Its totient is φ = 61660323532.

The previous prime is 61660323523. The next prime is 61660323541. The reversal of 61660323533 is 33532306616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61624587049 + 35736484 = 248243^2 + 5978^2 .

It is a cyclic number.

It is not a de Polignac number, because 61660323533 - 2¹⁰ = 61660322509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61660323523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30830161766 + 30830161767.

It is an arithmetic number, because the mean of its divisors is an integer number (30830161767).

Almost surely, 2^61660323533 is an apocalyptic number.

It is an amenable number.

61660323533 is a deficient number, since it is larger than the sum of its proper divisors (1).

61660323533 is an equidigital number, since it uses as much as digits as its factorization.

61660323533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 38.

The spelling of 61660323533 in words is "sixty-one billion, six hundred sixty million, three hundred twenty-three thousand, five hundred thirty-three".