247478891166 has 64 divisors (see below), whose sum is σ = 593664671040. Its totient is φ = 75966387840.

The previous prime is 247478891137. The next prime is 247478891167. The reversal of 247478891166 is 661198874742.

247478891166 is a `hidden beast` number, since 2 + 47 + 478 + 8 + 9 + 116 + 6 = 666.

It is a super-2 number, since 2×247478891166² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247478891167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123145 + ... + 714228.

It is an arithmetic number, because the mean of its divisors is an integer number (9276010485).

Almost surely, 2^247478891166 is an apocalyptic number.

247478891166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

247478891166 is an abundant number, since it is smaller than the sum of its proper divisors (346185779874).

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

247478891166 is a wasteful number, since it uses less digits than its factorization.

247478891166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837818 (or 837812 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 63.

The spelling of 247478891166 in words is "two hundred forty-seven billion, four hundred seventy-eight million, eight hundred ninety-one thousand, one hundred sixty-six".