78148656285777 has 128 divisors (see below), whose sum is σ = 150638702469120. Its totient is φ = 38826720472320.

The previous prime is 78148656285773. The next prime is 78148656285779. The reversal of 78148656285777 is 77758265684187.

78148656285777 is a `hidden beast` number, since 7 + 8 + 1 + 48 + 6 + 562 + 8 + 5 + 7 + 7 + 7 = 666.

It is not a de Polignac number, because 78148656285777 - 2² = 78148656285773 is a prime.

It is a super-2 number, since 2×78148656285777² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78148656285696 and 78148656285705.

It is not an unprimeable number, because it can be changed into a prime (78148656285773) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 393769423 + ... + 393967835.

It is an arithmetic number, because the mean of its divisors is an integer number (1176864863040).

Almost surely, 2^{78148656285777} is an apocalyptic number.

78148656285777 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

78148656285777 is a deficient number, since it is larger than the sum of its proper divisors (72490046183343).

78148656285777 is a wasteful number, since it uses less digits than its factorization.

78148656285777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206700 (or 206694 counting only the distinct ones).

The product of its digits is 8851046400, while the sum is 81.

The spelling of 78148656285777 in words is "seventy-eight trillion, one hundred forty-eight billion, six hundred fifty-six million, two hundred eighty-five thousand, seven hundred seventy-seven".