6425444661 has 8 divisors (see below), whose sum is σ = 9071216064. Its totient is φ = 4031651520.

The previous prime is 6425444659. The next prime is 6425444671. The reversal of 6425444661 is 1664445246.

6425444661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6425444661 - 2¹ = 6425444659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6425444621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62994505 + ... + 62994606.

It is an arithmetic number, because the mean of its divisors is an integer number (1133902008).

Almost surely, 2^6425444661 is an apocalyptic number.

It is an amenable number.

6425444661 is a deficient number, since it is larger than the sum of its proper divisors (2645771403).

6425444661 is a wasteful number, since it uses less digits than its factorization.

6425444661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125989131.

The product of its digits is 552960, while the sum is 42.

The square root of 6425444661 is about 80158.8713805278. The cubic root of 6425444661 is about 1859.0927726774.

The spelling of 6425444661 in words is "six billion, four hundred twenty-five million, four hundred forty-four thousand, six hundred sixty-one".