247478890997 has 16 divisors (see below), whose sum is σ = 270717726720. Its totient is φ = 224845993152.

The previous prime is 247478890987. The next prime is 247478891057. The reversal of 247478890997 is 799098874742.

It is a cyclic number.

It is not a de Polignac number, because 247478890997 - 2⁶ = 247478890933 is a prime.

It is a super-2 number, since 2×247478890997² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247478890987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 939404 + ... + 1173642.

It is an arithmetic number, because the mean of its divisors is an integer number (16919857920).

Almost surely, 2^247478890997 is an apocalyptic number.

It is an amenable number.

247478890997 is a deficient number, since it is larger than the sum of its proper divisors (23238835723).

247478890997 is a wasteful number, since it uses less digits than its factorization.

247478890997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235532.

The product of its (nonzero) digits is 512096256, while the sum is 74.

The spelling of 247478890997 in words is "two hundred forty-seven billion, four hundred seventy-eight million, eight hundred ninety thousand, nine hundred ninety-seven".