521666046 has 48 divisors (see below), whose sum is σ = 1305568368. Its totient is φ = 148780800.

The previous prime is 521666021. The next prime is 521666081. The reversal of 521666046 is 640666125.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 521666046.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74125 + ... + 80856.

It is an arithmetic number, because the mean of its divisors is an integer number (27199341).

Almost surely, 2^521666046 is an apocalyptic number.

521666046 is an abundant number, since it is smaller than the sum of its proper divisors (783902322).

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

521666046 is a wasteful number, since it uses less digits than its factorization.

521666046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155017 (or 155014 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 521666046 is about 22840.0097635706. The cubic root of 521666046 is about 805.0030456529.

The spelling of 521666046 in words is "five hundred twenty-one million, six hundred sixty-six thousand, forty-six".