400608220666 has 4 divisors (see below), whose sum is σ = 600912331002. Its totient is φ = 200304110332.

The previous prime is 400608220547. The next prime is 400608220673. The reversal of 400608220666 is 666022806004.

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

It can be written as a sum of positive squares in only one way, i.e., 295321599225 + 105286621441 = 543435^2 + 324479^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100152055165 + ... + 100152055168.

Almost surely, 2^400608220666 is an apocalyptic number.

400608220666 is a deficient number, since it is larger than the sum of its proper divisors (200304110336).

400608220666 is a wasteful number, since it uses less digits than its factorization.

400608220666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200304110335.

The product of its (nonzero) digits is 165888, while the sum is 40.

The spelling of 400608220666 in words is "four hundred billion, six hundred eight million, two hundred twenty thousand, six hundred sixty-six".