8400438728566 has 4 divisors (see below), whose sum is σ = 12600658092852. Its totient is φ = 4200219364282.

The previous prime is 8400438728551. The next prime is 8400438728567. The reversal of 8400438728566 is 6658278340048.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8400438728567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2100109682140 + ... + 2100109682143.

It is an arithmetic number, because the mean of its divisors is an integer number (3150164523213).

Almost surely, 2^{8400438728566} is an apocalyptic number.

8400438728566 is a deficient number, since it is larger than the sum of its proper divisors (4200219364286).

8400438728566 is a wasteful number, since it uses less digits than its factorization.

8400438728566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4200219364285.

The product of its (nonzero) digits is 61931520, while the sum is 61.

The spelling of 8400438728566 in words is "eight trillion, four hundred billion, four hundred thirty-eight million, seven hundred twenty-eight thousand, five hundred sixty-six".