247781366780 has 12 divisors (see below), whose sum is σ = 520340870280. Its totient is φ = 99112546704.

The previous prime is 247781366771. The next prime is 247781366803. The reversal of 247781366780 is 87663187742.

It is a super-2 number, since 2×247781366780² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6194534150 + ... + 6194534189.

It is an arithmetic number, because the mean of its divisors is an integer number (43361739190).

Almost surely, 2^247781366780 is an apocalyptic number.

247781366780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

247781366780 is an abundant number, since it is smaller than the sum of its proper divisors (272559503500).

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

247781366780 is a wasteful number, since it uses less digits than its factorization.

247781366780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12389068348 (or 12389068346 counting only the distinct ones).

The product of its (nonzero) digits is 18966528, while the sum is 59.

The spelling of 247781366780 in words is "two hundred forty-seven billion, seven hundred eighty-one million, three hundred sixty-six thousand, seven hundred eighty".