61656166711 has 4 divisors (see below), whose sum is σ = 61796614000. Its totient is φ = 61515719424.

The previous prime is 61656166697. The next prime is 61656166721. The reversal of 61656166711 is 11766165616.

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 61656166711 - 2¹¹ = 61656164663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61656166721) 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, 70222986 + ... + 70223863.

It is an arithmetic number, because the mean of its divisors is an integer number (15449153500).

Almost surely, 2^61656166711 is an apocalyptic number.

61656166711 is a deficient number, since it is larger than the sum of its proper divisors (140447289).

61656166711 is a wasteful number, since it uses less digits than its factorization.

61656166711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140447288.

The product of its digits is 272160, while the sum is 46.

The spelling of 61656166711 in words is "sixty-one billion, six hundred fifty-six million, one hundred sixty-six thousand, seven hundred eleven".