665245251629 has 4 divisors (see below), whose sum is σ = 760280287584. Its totient is φ = 570210215676.

The previous prime is 665245251623. The next prime is 665245251647. The reversal of 665245251629 is 926152542566.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 926152542566 = 2 ⋅463076271283.

It is a cyclic number.

It is not a de Polignac number, because 665245251629 - 2⁴ = 665245251613 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 (665245251623) 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, 47517517967 + ... + 47517517980.

It is an arithmetic number, because the mean of its divisors is an integer number (190070071896).

Almost surely, 2^665245251629 is an apocalyptic number.

It is an amenable number.

665245251629 is a deficient number, since it is larger than the sum of its proper divisors (95035035955).

665245251629 is an equidigital number, since it uses as much as digits as its factorization.

665245251629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95035035954.

The product of its digits is 7776000, while the sum is 53.

The spelling of 665245251629 in words is "six hundred sixty-five billion, two hundred forty-five million, two hundred fifty-one thousand, six hundred twenty-nine".