61669310647 has 8 divisors (see below), whose sum is σ = 71809009056. Its totient is φ = 51862061472.

The previous prime is 61669310623. The next prime is 61669310663. The reversal of 61669310647 is 74601396616.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61669310647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61669310647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61669350647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83111908 + ... + 83112649.

It is an arithmetic number, because the mean of its divisors is an integer number (8976126132).

Almost surely, 2^61669310647 is an apocalyptic number.

61669310647 is a deficient number, since it is larger than the sum of its proper divisors (10139698409).

61669310647 is a wasteful number, since it uses less digits than its factorization.

61669310647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166224617.

The product of its (nonzero) digits is 979776, while the sum is 49.

The spelling of 61669310647 in words is "sixty-one billion, six hundred sixty-nine million, three hundred ten thousand, six hundred forty-seven".