77450784157 has 2 divisors, whose sum is σ = 77450784158. Its totient is φ = 77450784156.

The previous prime is 77450784139. The next prime is 77450784199. The reversal of 77450784157 is 75148705477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40640140836 + 36810643321 = 201594^2 + 191861^2 .

It is a cyclic number.

It is not a de Polignac number, because 77450784157 - 2³¹ = 75303300509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77450784098 and 77450784107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77450484157) by changing a digit.

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 as a sum of consecutive naturals, namely, 38725392078 + 38725392079.

It is an arithmetic number, because the mean of its divisors is an integer number (38725392079).

Almost surely, 2^77450784157 is an apocalyptic number.

It is an amenable number.

77450784157 is a deficient number, since it is larger than the sum of its proper divisors (1).

77450784157 is an equidigital number, since it uses as much as digits as its factorization.

77450784157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7683200, while the sum is 55.

The spelling of 77450784157 in words is "seventy-seven billion, four hundred fifty million, seven hundred eighty-four thousand, one hundred fifty-seven".