475666780521 has 16 divisors (see below), whose sum is σ = 654066309248. Its totient is φ = 307260345600.

The previous prime is 475666780517. The next prime is 475666780543. The reversal of 475666780521 is 125087666574.

It is not a de Polignac number, because 475666780521 - 2² = 475666780517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (475666780621) 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, 8863885 + ... + 8917386.

It is an arithmetic number, because the mean of its divisors is an integer number (40879144328).

Almost surely, 2^475666780521 is an apocalyptic number.

It is an amenable number.

475666780521 is a deficient number, since it is larger than the sum of its proper divisors (178399528727).

475666780521 is a wasteful number, since it uses less digits than its factorization.

475666780521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17781552.

The product of its (nonzero) digits is 16934400, while the sum is 57.

The spelling of 475666780521 in words is "four hundred seventy-five billion, six hundred sixty-six million, seven hundred eighty thousand, five hundred twenty-one".