64661426526 has 16 divisors (see below), whose sum is σ = 129327571728. Its totient is φ = 21553022400.

The previous prime is 64661426521. The next prime is 64661426561. The reversal of 64661426526 is 62562416646.

It is a super-2 number, since 2×64661426526² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64661426521) 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, 3945 + ... + 359636.

It is an arithmetic number, because the mean of its divisors is an integer number (8082973233).

Almost surely, 2^64661426526 is an apocalyptic number.

64661426526 is an abundant number, since it is smaller than the sum of its proper divisors (64666145202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64661426526 is a wasteful number, since it uses less digits than its factorization.

64661426526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393227.

The product of its digits is 2488320, while the sum is 48.

The spelling of 64661426526 in words is "sixty-four billion, six hundred sixty-one million, four hundred twenty-six thousand, five hundred twenty-six".