61866554018 has 16 divisors (see below), whose sum is σ = 97689340320. Its totient is φ = 29303617536.

The previous prime is 61866553997. The next prime is 61866554033. The reversal of 61866554018 is 81045566816.

It is a super-2 number, since 2×61866554018² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

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, 961121 + ... + 1023467.

It is an arithmetic number, because the mean of its divisors is an integer number (6105583770).

Almost surely, 2^61866554018 is an apocalyptic number.

61866554018 is a deficient number, since it is larger than the sum of its proper divisors (35822786302).

61866554018 is a wasteful number, since it uses less digits than its factorization.

61866554018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88481.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 61866554018 in words is "sixty-one billion, eight hundred sixty-six million, five hundred fifty-four thousand, eighteen".