77884451645444 has 6 divisors (see below), whose sum is σ = 136297790379534. Its totient is φ = 38942225822720.

The previous prime is 77884451645443. The next prime is 77884451645467. The reversal of 77884451645444 is 44454615448877.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 52633022639044 + 25251429006400 = 7254862^2 + 5025080^2 .

It is a super-2 number, since 2×77884451645444² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77884451645443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9735556455677 + ... + 9735556455684.

It is an arithmetic number, because the mean of its divisors is an integer number (22716298396589).

Almost surely, 2^{77884451645444} is an apocalyptic number.

It is an amenable number.

77884451645444 is a deficient number, since it is larger than the sum of its proper divisors (58413338734090).

77884451645444 is a wasteful number, since it uses less digits than its factorization.

77884451645444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19471112911365 (or 19471112911363 counting only the distinct ones).

The product of its digits is 1926758400, while the sum is 71.

The spelling of 77884451645444 in words is "seventy-seven trillion, eight hundred eighty-four billion, four hundred fifty-one million, six hundred forty-five thousand, four hundred forty-four".