665151263 has 4 divisors (see below), whose sum is σ = 760172880. Its totient is φ = 570129648.

The previous prime is 665151239. The next prime is 665151271. The reversal of 665151263 is 362151566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665151263 - 2⁶ = 665151199 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 (665151233) 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, 47510798 + ... + 47510811.

It is an arithmetic number, because the mean of its divisors is an integer number (190043220).

Almost surely, 2^665151263 is an apocalyptic number.

665151263 is a deficient number, since it is larger than the sum of its proper divisors (95021617).

665151263 is an equidigital number, since it uses as much as digits as its factorization.

665151263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95021616.

The product of its digits is 32400, while the sum is 35.

The square root of 665151263 is about 25790.5266134680. The cubic root of 665151263 is about 872.9180490492.

The spelling of 665151263 in words is "six hundred sixty-five million, one hundred fifty-one thousand, two hundred sixty-three".