641706751 has 16 divisors (see below), whose sum is σ = 760343040. Its totient is φ = 529895520.

The previous prime is 641706749. The next prime is 641706761. The reversal of 641706751 is 157607146.

It is not a de Polignac number, because 641706751 - 2¹ = 641706749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641706751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641706731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95616 + ... + 102106.

It is an arithmetic number, because the mean of its divisors is an integer number (47521440).

Almost surely, 2^641706751 is an apocalyptic number.

641706751 is a deficient number, since it is larger than the sum of its proper divisors (118636289).

641706751 is a wasteful number, since it uses less digits than its factorization.

641706751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7014.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 641706751 is about 25331.9314502467. The cubic root of 641706751 is about 862.5392551202.

The spelling of 641706751 in words is "six hundred forty-one million, seven hundred six thousand, seven hundred fifty-one".