61966681963 has 8 divisors (see below), whose sum is σ = 65951741808. Its totient is φ = 58019395584.

The previous prime is 61966681951. The next prime is 61966681991. The reversal of 61966681963 is 36918666916.

61966681963 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 61966681963 - 2³³ = 53376747371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61966681463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9439981 + ... + 9446542.

It is an arithmetic number, because the mean of its divisors is an integer number (8243967726).

Almost surely, 2^61966681963 is an apocalyptic number.

61966681963 is a deficient number, since it is larger than the sum of its proper divisors (3985059845).

61966681963 is a wasteful number, since it uses less digits than its factorization.

61966681963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18886733.

The product of its digits is 15116544, while the sum is 61.

The spelling of 61966681963 in words is "sixty-one billion, nine hundred sixty-six million, six hundred eighty-one thousand, nine hundred sixty-three".