6426421481938 has 4 divisors (see below), whose sum is σ = 9639632222910. Its totient is φ = 3213210740968.

The previous prime is 6426421481929. The next prime is 6426421481957. The reversal of 6426421481938 is 8391841246246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4779221216449 + 1647200265489 = 2186143^2 + 1283433^2 .

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 as a sum of consecutive naturals, namely, 1606605370483 + ... + 1606605370486.

Almost surely, 2^{6426421481938} is an apocalyptic number.

6426421481938 is a deficient number, since it is larger than the sum of its proper divisors (3213210740972).

6426421481938 is a wasteful number, since it uses less digits than its factorization.

6426421481938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3213210740971.

The product of its digits is 15925248, while the sum is 58.

The spelling of 6426421481938 in words is "six trillion, four hundred twenty-six billion, four hundred twenty-one million, four hundred eighty-one thousand, nine hundred thirty-eight".