866557442 has 8 divisors (see below), whose sum is σ = 1300182732. Its totient is φ = 433163200.

The previous prime is 866557429. The next prime is 866557451. The reversal of 866557442 is 244755668.

It can be written as a sum of positive squares in 2 ways, for example, as 866066041 + 491401 = 29429^2 + 701^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48059 + ... + 63582.

Almost surely, 2^866557442 is an apocalyptic number.

866557442 is a deficient number, since it is larger than the sum of its proper divisors (433625290).

866557442 is a wasteful number, since it uses less digits than its factorization.

866557442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115524.

The product of its digits is 1612800, while the sum is 47.

The square root of 866557442 is about 29437.3477405829. The cubic root of 866557442 is about 953.3794476474.

The spelling of 866557442 in words is "eight hundred sixty-six million, five hundred fifty-seven thousand, four hundred forty-two".