6421264425 has 36 divisors (see below), whose sum is σ = 11505967564. Its totient is φ = 3423254400.

The previous prime is 6421264411. The next prime is 6421264441. The reversal of 6421264425 is 5244621246.

6421264425 is a `hidden beast` number, since 6 + 4 + 2 + 1 + 2 + 644 + 2 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 900180009 + 5521084416 = 30003^2 + 74304^2 .

It is not a de Polignac number, because 6421264425 - 2¹⁵ = 6421231657 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 6421264425.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 754695 + ... + 763155.

Almost surely, 2^6421264425 is an apocalyptic number.

It is an amenable number.

6421264425 is a deficient number, since it is larger than the sum of its proper divisors (5084703139).

6421264425 is a wasteful number, since it uses less digits than its factorization.

6421264425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11850 (or 11842 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

The square root of 6421264425 is about 80132.7924447913. The cubic root of 6421264425 is about 1858.6895252313.

The spelling of 6421264425 in words is "six billion, four hundred twenty-one million, two hundred sixty-four thousand, four hundred twenty-five".