61866836523 has 6 divisors (see below), whose sum is σ = 89363208324. Its totient is φ = 41244557676.

The previous prime is 61866836519. The next prime is 61866836569. The reversal of 61866836523 is 32563866816.

It is a happy number.

61866836523 is a `hidden beast` number, since 6 + 1 + 86 + 6 + 8 + 36 + 523 = 666.

It is not a de Polignac number, because 61866836523 - 2² = 61866836519 is a prime.

It is a super-2 number, since 2×61866836523² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61866836523.

It is not an unprimeable number, because it can be changed into a prime (61866836573) 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 5 ways as a sum of consecutive naturals, for example, 3437046465 + ... + 3437046482.

It is an arithmetic number, because the mean of its divisors is an integer number (14893868054).

Almost surely, 2^61866836523 is an apocalyptic number.

61866836523 is a deficient number, since it is larger than the sum of its proper divisors (27496371801).

61866836523 is a wasteful number, since it uses less digits than its factorization.

61866836523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6874092953 (or 6874092950 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The spelling of 61866836523 in words is "sixty-one billion, eight hundred sixty-six million, eight hundred thirty-six thousand, five hundred twenty-three".