665605157 has 8 divisors (see below), whose sum is σ = 761851200. Its totient is φ = 569649024.

The previous prime is 665605153. The next prime is 665605159. The reversal of 665605157 is 751506566.

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

It is not a de Polignac number, because 665605157 - 2² = 665605153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665605153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67532 + ... + 76757.

It is an arithmetic number, because the mean of its divisors is an integer number (95231400).

Almost surely, 2^665605157 is an apocalyptic number.

It is an amenable number.

665605157 is a deficient number, since it is larger than the sum of its proper divisors (96246043).

665605157 is a wasteful number, since it uses less digits than its factorization.

665605157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144955.

The product of its (nonzero) digits is 189000, while the sum is 41.

The square root of 665605157 is about 25799.3247392252. The cubic root of 665605157 is about 873.1165613762.

It can be divided in two parts, 66560 and 5157, that added together give a palindrome (71717).

The spelling of 665605157 in words is "six hundred sixty-five million, six hundred five thousand, one hundred fifty-seven".