786381974721 has 30 divisors (see below), whose sum is σ = 1366509575970. Its totient is φ = 449361126144.

The previous prime is 786381974717. The next prime is 786381974737. The reversal of 786381974721 is 127479183687.

786381974721 is a `hidden beast` number, since 7 + 86 + 3 + 81 + 9 + 7 + 472 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 727643120400 + 58738854321 = 853020^2 + 242361^2 .

It is not a de Polignac number, because 786381974721 - 2² = 786381974717 is a prime.

It is a super-2 number, since 2×786381974721² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (786381974701) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 99061536 + ... + 99069473.

It is an arithmetic number, because the mean of its divisors is an integer number (45550319199).

Almost surely, 2^786381974721 is an apocalyptic number.

It is an amenable number.

786381974721 is a deficient number, since it is larger than the sum of its proper divisors (580127601249).

786381974721 is a wasteful number, since it uses less digits than its factorization.

786381974721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198131035 (or 198131019 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The spelling of 786381974721 in words is "seven hundred eighty-six billion, three hundred eighty-one million, nine hundred seventy-four thousand, seven hundred twenty-one".