420613665 has 8 divisors (see below), whose sum is σ = 672981888. Its totient is φ = 224327280.

The previous prime is 420613657. The next prime is 420613679. The reversal of 420613665 is 566316024.

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

It is not a de Polignac number, because 420613665 - 2³ = 420613657 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14020441 + ... + 14020470.

It is an arithmetic number, because the mean of its divisors is an integer number (84122736).

Almost surely, 2^420613665 is an apocalyptic number.

It is an amenable number.

420613665 is a deficient number, since it is larger than the sum of its proper divisors (252368223).

420613665 is a wasteful number, since it uses less digits than its factorization.

420613665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28040919.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 420613665 is about 20508.8679599826. The cubic root of 420613665 is about 749.2517960582.

Adding to 420613665 its reverse (566316024), we get a palindrome (986929689).

It can be divided in two parts, 4206 and 13665, that added together give a palindrome (17871).

The spelling of 420613665 in words is "four hundred twenty million, six hundred thirteen thousand, six hundred sixty-five".