61630517661571 has 4 divisors (see below), whose sum is σ = 61726366056712. Its totient is φ = 61534669266432.

The previous prime is 61630517661553. The next prime is 61630517661653. The reversal of 61630517661571 is 17516671503616.

61630517661571 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61630517661571 - 2⁷ = 61630517661443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61630517668571) 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 3 ways as a sum of consecutive naturals, for example, 47924196606 + ... + 47924197891.

It is an arithmetic number, because the mean of its divisors is an integer number (15431591514178).

Almost surely, 2^{61630517661571} is an apocalyptic number.

61630517661571 is a deficient number, since it is larger than the sum of its proper divisors (95848395141).

61630517661571 is an equidigital number, since it uses as much as digits as its factorization.

61630517661571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95848395140.

The product of its (nonzero) digits is 4762800, while the sum is 55.

The spelling of 61630517661571 in words is "sixty-one trillion, six hundred thirty billion, five hundred seventeen million, six hundred sixty-one thousand, five hundred seventy-one".