247640743505 has 16 divisors (see below), whose sum is σ = 300092943744. Its totient is φ = 196169850240.

The previous prime is 247640743499. The next prime is 247640743523. The reversal of 247640743505 is 505347046742.

247640743505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 247640743505 - 2²⁸ = 247372308049 is a prime.

It is a super-2 number, since 2×247640743505² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 247640743505.

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, 114317 + ... + 712986.

It is an arithmetic number, because the mean of its divisors is an integer number (18755808984).

Almost surely, 2^247640743505 is an apocalyptic number.

It is an amenable number.

247640743505 is a deficient number, since it is larger than the sum of its proper divisors (52452200239).

247640743505 is a wasteful number, since it uses less digits than its factorization.

247640743505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827896.

The product of its (nonzero) digits is 2822400, while the sum is 47.

The spelling of 247640743505 in words is "two hundred forty-seven billion, six hundred forty million, seven hundred forty-three thousand, five hundred five".