61630645665 has 8 divisors (see below), whose sum is σ = 98609033088. Its totient is φ = 32869677680.

The previous prime is 61630645613. The next prime is 61630645669. The reversal of 61630645665 is 56654603616.

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

It is not a de Polignac number, because 61630645665 - 2⁸ = 61630645409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61630645669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2054354841 + ... + 2054354870.

It is an arithmetic number, because the mean of its divisors is an integer number (12326129136).

Almost surely, 2^61630645665 is an apocalyptic number.

It is an amenable number.

61630645665 is a deficient number, since it is larger than the sum of its proper divisors (36978387423).

61630645665 is a wasteful number, since it uses less digits than its factorization.

61630645665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4108709719.

The product of its (nonzero) digits is 2332800, while the sum is 48.

The spelling of 61630645665 in words is "sixty-one billion, six hundred thirty million, six hundred forty-five thousand, six hundred sixty-five".