61661317406403 has 16 divisors (see below), whose sum is σ = 96588357336576. Its totient is φ = 34495841905440.

The previous prime is 61661317406389. The next prime is 61661317406413. The reversal of 61661317406403 is 30460471316616.

61661317406403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61661317406403 - 2⁵ = 61661317406371 is a prime.

It is a super-3 number, since 3×61661317406403³ (a number of 42 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (61661317406413) 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 in 15 ways as a sum of consecutive naturals, for example, 71866336875 + ... + 71866337732.

It is an arithmetic number, because the mean of its divisors is an integer number (6036772333536).

Almost surely, 2^{61661317406403} is an apocalyptic number.

61661317406403 is a deficient number, since it is larger than the sum of its proper divisors (34927039930173).

61661317406403 is a wasteful number, since it uses less digits than its factorization.

61661317406403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143732674634.

The product of its (nonzero) digits is 1306368, while the sum is 48.

The spelling of 61661317406403 in words is "sixty-one trillion, six hundred sixty-one billion, three hundred seventeen million, four hundred six thousand, four hundred three".