647421436806675 has 24 divisors (see below), whose sum is σ = 1070560186838640. Its totient is φ = 345240870172800.

The previous prime is 647421436806631. The next prime is 647421436806679. The reversal of 647421436806675 is 576608634124746.

It is not a de Polignac number, because 647421436806675 - 2¹⁶ = 647421436741139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647421436806679) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 631519296 + ... + 632543645.

It is an arithmetic number, because the mean of its divisors is an integer number (44606674451610).

Almost surely, 2^{647421436806675} is an apocalyptic number.

647421436806675 is a deficient number, since it is larger than the sum of its proper divisors (423138750031965).

647421436806675 is a wasteful number, since it uses less digits than its factorization.

647421436806675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1264069783 (or 1264069778 counting only the distinct ones).

The product of its (nonzero) digits is 975421440, while the sum is 69.

The spelling of 647421436806675 in words is "six hundred forty-seven trillion, four hundred twenty-one billion, four hundred thirty-six million, eight hundred six thousand, six hundred seventy-five".