77755778325 has 18 divisors (see below), whose sum is σ = 139269238914. Its totient is φ = 41469748320.

The previous prime is 77755778323. The next prime is 77755778333. The reversal of 77755778325 is 52387755777.

It is a happy number.

77755778325 is a `hidden beast` number, since 7 + 7 + 7 + 557 + 78 + 3 + 2 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 1690689924 + 76065088401 = 41118^2 + 275799^2 .

It is not a de Polignac number, because 77755778325 - 2¹ = 77755778323 is a prime.

It is a super-2 number, since 2×77755778325² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77755778323) 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, 172790394 + ... + 172790843.

Almost surely, 2^77755778325 is an apocalyptic number.

77755778325 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

77755778325 is a deficient number, since it is larger than the sum of its proper divisors (61513460589).

77755778325 is a wasteful number, since it uses less digits than its factorization.

77755778325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345581253 (or 345581245 counting only the distinct ones).

The product of its digits is 100842000, while the sum is 63.

The spelling of 77755778325 in words is "seventy-seven billion, seven hundred fifty-five million, seven hundred seventy-eight thousand, three hundred twenty-five".