641407669 has 4 divisors (see below), whose sum is σ = 733037344. Its totient is φ = 549777996.

The previous prime is 641407661. The next prime is 641407699. The reversal of 641407669 is 966704146.

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.

It is a cyclic number.

It is not a de Polignac number, because 641407669 - 2³ = 641407661 is a prime.

It is a super-2 number, since 2×641407669² = 822807595704027122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641407661) 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, 45814827 + ... + 45814840.

It is an arithmetic number, because the mean of its divisors is an integer number (183259336).

Almost surely, 2^641407669 is an apocalyptic number.

It is an amenable number.

641407669 is a deficient number, since it is larger than the sum of its proper divisors (91629675).

641407669 is an equidigital number, since it uses as much as digits as its factorization.

641407669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91629674.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 641407669 is about 25326.0275013670. The cubic root of 641407669 is about 862.4052322958.

The spelling of 641407669 in words is "six hundred forty-one million, four hundred seven thousand, six hundred sixty-nine".