68781839653440 has 168 divisors, whose sum is σ = 245343124004160. Its totient is φ = 18341823886848.

The previous prime is 68781839653421. The next prime is 68781839653463. The reversal of 68781839653440 is 4435693818786.

68781839653440 is a `hidden beast` number, since 6 + 8 + 7 + 8 + 1 + 83 + 9 + 6 + 534 + 4 + 0 = 666.

It is a super-2 number, since 2×68781839653440² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 442192300 + ... + 442347819.

It is an arithmetic number, because the mean of its divisors is an integer number (1460375738120).

Almost surely, 2^{68781839653440} is an apocalyptic number.

68781839653440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68781839653440 is an abundant number, since it is smaller than the sum of its proper divisors (176561284350720).

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

68781839653440 is an equidigital number, since it uses as much as digits as its factorization.

68781839653440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884540151 (or 884540129 counting only the distinct ones).

The product of its (nonzero) digits is 836075520, while the sum is 72.

The spelling of 68781839653440 in words is "sixty-eight trillion, seven hundred eighty-one billion, eight hundred thirty-nine million, six hundred fifty-three thousand, four hundred forty".