665025401 has 8 divisors (see below), whose sum is σ = 689816160. Its totient is φ = 640658592.

The previous prime is 665025391. The next prime is 665025409. The reversal of 665025401 is 104520566.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665025401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665025409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102791 + ... + 109068.

It is an arithmetic number, because the mean of its divisors is an integer number (86227020).

Almost surely, 2^665025401 is an apocalyptic number.

It is an amenable number.

665025401 is a deficient number, since it is larger than the sum of its proper divisors (24790759).

665025401 is a wasteful number, since it uses less digits than its factorization.

665025401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211975.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 665025401 is about 25788.0864160178. The cubic root of 665025401 is about 872.8629868159.

Adding to 665025401 its reverse (104520566), we get a palindrome (769545967).

The spelling of 665025401 in words is "six hundred sixty-five million, twenty-five thousand, four hundred one".