977756808657778 has 32 divisors (see below), whose sum is σ = 1606479727017600. Its totient is φ = 444248169464064.

The previous prime is 977756808657763. The next prime is 977756808657799. The reversal of 977756808657778 is 877756808657779.

It is a self number, because there is not a number n which added to its sum of digits gives 977756808657778.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61130451 + ... + 75448297.

It is an arithmetic number, because the mean of its divisors is an integer number (50202491469300).

Almost surely, 2^{977756808657778} is an apocalyptic number.

977756808657778 is a deficient number, since it is larger than the sum of its proper divisors (628722918359822).

977756808657778 is a wasteful number, since it uses less digits than its factorization.

977756808657778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14387154.

The product of its (nonzero) digits is 487913932800, while the sum is 97.

Subtracting from 977756808657778 its reverse (877756808657779), we obtain a palindrome (99999999999999).

The spelling of 977756808657778 in words is "nine hundred seventy-seven trillion, seven hundred fifty-six billion, eight hundred eight million, six hundred fifty-seven thousand, seven hundred seventy-eight".