77133780437778 has 36 divisors (see below), whose sum is σ = 169907829053274. Its totient is φ = 25289764056000.

The previous prime is 77133780437771. The next prime is 77133780437789. The reversal of 77133780437778 is 87773408733177.

77133780437778 is a `hidden beast` number, since 7 + 7 + 13 + 37 + 80 + 437 + 7 + 78 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 14218155865809 + 62915624571969 = 3770697^2 + 7931937^2 .

It is not an unprimeable number, because it can be changed into a prime (77133780437771) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 575747323 + ... + 575881278.

Almost surely, 2^{77133780437778} is an apocalyptic number.

77133780437778 is an abundant number, since it is smaller than the sum of its proper divisors (92774048615496).

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

77133780437778 is a wasteful number, since it uses less digits than its factorization.

77133780437778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151628731 (or 1151628667 counting only the distinct ones).

The product of its (nonzero) digits is 813189888, while the sum is 72.

The spelling of 77133780437778 in words is "seventy-seven trillion, one hundred thirty-three billion, seven hundred eighty million, four hundred thirty-seven thousand, seven hundred seventy-eight".