641770653 has 4 divisors (see below), whose sum is σ = 855694208. Its totient is φ = 427847100.

The previous prime is 641770651. The next prime is 641770681. The reversal of 641770653 is 356077146.

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 not a de Polignac number, because 641770653 - 2¹ = 641770651 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 (641770651) 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, 106961773 + ... + 106961778.

It is an arithmetic number, because the mean of its divisors is an integer number (213923552).

Almost surely, 2^641770653 is an apocalyptic number.

It is an amenable number.

641770653 is a deficient number, since it is larger than the sum of its proper divisors (213923555).

641770653 is a wasteful number, since it uses less digits than its factorization.

641770653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213923554.

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 641770653 is about 25333.1927123290. The cubic root of 641770653 is about 862.5678851000.

The spelling of 641770653 in words is "six hundred forty-one million, seven hundred seventy thousand, six hundred fifty-three".