77851482981966 has 48 divisors (see below), whose sum is σ = 168987993462288. Its totient is φ = 25902845107200.

The previous prime is 77851482981953. The next prime is 77851482981967. The reversal of 77851482981966 is 66918928415877.

77851482981966 is a `hidden beast` number, since 7 + 7 + 8 + 51 + 482 + 9 + 81 + 9 + 6 + 6 = 666.

It is a super-2 number, since 2×77851482981966² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77851482981967) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101515036 + ... + 102279056.

It is an arithmetic number, because the mean of its divisors is an integer number (3520583197131).

Almost surely, 2^{77851482981966} is an apocalyptic number.

77851482981966 is an abundant number, since it is smaller than the sum of its proper divisors (91136510480322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77851482981966 is a wasteful number, since it uses less digits than its factorization.

77851482981966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774417 (or 774414 counting only the distinct ones).

The product of its digits is 2926264320, while the sum is 81.

The spelling of 77851482981966 in words is "seventy-seven trillion, eight hundred fifty-one billion, four hundred eighty-two million, nine hundred eighty-one thousand, nine hundred sixty-six".