61966512818 has 16 divisors (see below), whose sum is σ = 106231777344. Its totient is φ = 26556209520.

The previous prime is 61966512791. The next prime is 61966512827. The reversal of 61966512818 is 81821566916.

It is a super-2 number, since 2×61966512818² (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 61966512818.

It is an unprimeable number.

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, 566021 + ... + 666567.

It is an arithmetic number, because the mean of its divisors is an integer number (6639486084).

Almost surely, 2^61966512818 is an apocalyptic number.

61966512818 is a deficient number, since it is larger than the sum of its proper divisors (44265264526).

61966512818 is a wasteful number, since it uses less digits than its factorization.

61966512818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144577.

The product of its digits is 1244160, while the sum is 53.

The spelling of 61966512818 in words is "sixty-one billion, nine hundred sixty-six million, five hundred twelve thousand, eight hundred eighteen".