425909781681 has 32 divisors (see below), whose sum is σ = 610781836800. Its totient is φ = 263182711680.

The previous prime is 425909781677. The next prime is 425909781743. The reversal of 425909781681 is 186187909524.

It is not a de Polignac number, because 425909781681 - 2² = 425909781677 is a prime.

It is a super-2 number, since 2×425909781681² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (425909781881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 409485 + ... + 1009701.

It is an arithmetic number, because the mean of its divisors is an integer number (19086932400).

Almost surely, 2^425909781681 is an apocalyptic number.

It is an amenable number.

425909781681 is a deficient number, since it is larger than the sum of its proper divisors (184872055119).

425909781681 is a wasteful number, since it uses less digits than its factorization.

425909781681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600509.

The product of its (nonzero) digits is 8709120, while the sum is 60.

The spelling of 425909781681 in words is "four hundred twenty-five billion, nine hundred nine million, seven hundred eighty-one thousand, six hundred eighty-one".