666415426 has 8 divisors (see below), whose sum is σ = 1004857344. Its totient is φ = 331462980.

The previous prime is 666415417. The next prime is 666415429. The reversal of 666415426 is 624514666.

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

It is a super-2 number, since 2×666415426² = 888219040021522952, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666415429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 871890 + ... + 872653.

It is an arithmetic number, because the mean of its divisors is an integer number (125607168).

Almost surely, 2^666415426 is an apocalyptic number.

666415426 is a deficient number, since it is larger than the sum of its proper divisors (338441918).

666415426 is a wasteful number, since it uses less digits than its factorization.

666415426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744736.

The product of its digits is 207360, while the sum is 40.

The square root of 666415426 is about 25815.0232616591. The cubic root of 666415426 is about 873.4707114787.

The spelling of 666415426 in words is "six hundred sixty-six million, four hundred fifteen thousand, four hundred twenty-six".