67778126520 has 64 divisors (see below), whose sum is σ = 218975490720. Its totient is φ = 16683846144.

The previous prime is 67778126513. The next prime is 67778126567. The reversal of 67778126520 is 2562187776.

It is a super-2 number, since 2×67778126520² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21722199 + ... + 21725318.

Almost surely, 2^67778126520 is an apocalyptic number.

67778126520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

67778126520 is an abundant number, since it is smaller than the sum of its proper divisors (151197364200).

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

67778126520 is a wasteful number, since it uses less digits than its factorization.

67778126520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43447544 (or 43447540 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 51.

The spelling of 67778126520 in words is "sixty-seven billion, seven hundred seventy-eight million, one hundred twenty-six thousand, five hundred twenty".