778485197644560 has 480 divisors, whose sum is σ = 3068750811639552. Its totient is φ = 173124859023360.

The previous prime is 778485197644499. The next prime is 778485197644603. The reversal of 778485197644560 is 65446791584877.

778485197644560 is a `hidden beast` number, since 7 + 7 + 8 + 4 + 8 + 5 + 1 + 9 + 7 + 6 + 44 + 560 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 778485197644560.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10131606462 + ... + 10131683298.

Almost surely, 2^{778485197644560} is an apocalyptic number.

778485197644560 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778485197644560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1534375405819776).

778485197644560 is an abundant number, since it is smaller than the sum of its proper divisors (2290265613994992).

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

778485197644560 is a wasteful number, since it uses less digits than its factorization.

778485197644560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131231 (or 131222 counting only the distinct ones).

The product of its (nonzero) digits is 11379916800, while the sum is 81.

The spelling of 778485197644560 in words is "seven hundred seventy-eight trillion, four hundred eighty-five billion, one hundred ninety-seven million, six hundred forty-four thousand, five hundred sixty".