77778632331 has 6 divisors (see below), whose sum is σ = 112346913380. Its totient is φ = 51852421548.

The previous prime is 77778632317. The next prime is 77778632383. The reversal of 77778632331 is 13323687777.

It is not a de Polignac number, because 77778632331 - 2¹³ = 77778624139 is a prime.

It is a super-2 number, since 2×77778632331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77778632131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4321035121 + ... + 4321035138.

Almost surely, 2^77778632331 is an apocalyptic number.

77778632331 is a deficient number, since it is larger than the sum of its proper divisors (34568281049).

77778632331 is a wasteful number, since it uses less digits than its factorization.

77778632331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8642070265 (or 8642070262 counting only the distinct ones).

The product of its digits is 6223392, while the sum is 54.

The spelling of 77778632331 in words is "seventy-seven billion, seven hundred seventy-eight million, six hundred thirty-two thousand, three hundred thirty-one".