61660246991 has 8 divisors (see below), whose sum is σ = 70471424640. Its totient is φ = 52849712088.

The previous prime is 61660246979. The next prime is 61660247009. The reversal of 61660246991 is 19964206616.

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 61660246991 - 2²² = 61656052687 is a prime.

It is a super-2 number, since 2×61660246991² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61660206991) 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 7 ways as a sum of consecutive naturals, for example, 66260 + ... + 357366.

It is an arithmetic number, because the mean of its divisors is an integer number (8808928080).

Almost surely, 2^61660246991 is an apocalyptic number.

61660246991 is a deficient number, since it is larger than the sum of its proper divisors (8811177649).

61660246991 is a wasteful number, since it uses less digits than its factorization.

61660246991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321373.

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 61660246991 in words is "sixty-one billion, six hundred sixty million, two hundred forty-six thousand, nine hundred ninety-one".