426556665 has 32 divisors (see below), whose sum is σ = 760233600. Its totient is φ = 226923840.

The previous prime is 426556651. The next prime is 426556693. The reversal of 426556665 is 566655624.

It is a happy number.

It is not a de Polignac number, because 426556665 - 2⁴ = 426556649 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 426556665.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52795 + ... + 60335.

It is an arithmetic number, because the mean of its divisors is an integer number (23757300).

Almost surely, 2^426556665 is an apocalyptic number.

426556665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

426556665 is a deficient number, since it is larger than the sum of its proper divisors (333676935).

426556665 is a wasteful number, since it uses less digits than its factorization.

426556665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7974 (or 7968 counting only the distinct ones).

The product of its digits is 1296000, while the sum is 45.

The square root of 426556665 is about 20653.2482917337. The cubic root of 426556665 is about 752.7641203368.

The spelling of 426556665 in words is "four hundred twenty-six million, five hundred fifty-six thousand, six hundred sixty-five".