64126405644 has 72 divisors (see below), whose sum is σ = 176655366720. Its totient is φ = 18048358944.

The previous prime is 64126405571. The next prime is 64126405691. The reversal of 64126405644 is 44650462146.

It is a super-2 number, since 2×64126405644² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 64126405596 and 64126405605.

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 23 ways as a sum of consecutive naturals, for example, 774474 + ... + 853265.

It is an arithmetic number, because the mean of its divisors is an integer number (2453546760).

Almost surely, 2^64126405644 is an apocalyptic number.

It is an amenable number.

64126405644 is an abundant number, since it is smaller than the sum of its proper divisors (112528961076).

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

64126405644 is a wasteful number, since it uses less digits than its factorization.

64126405644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627827 (or 1627818 counting only the distinct ones).

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

The spelling of 64126405644 in words is "sixty-four billion, one hundred twenty-six million, four hundred five thousand, six hundred forty-four".