664126234452 has 18 divisors (see below), whose sum is σ = 1678763537178. Its totient is φ = 221375411472.

The previous prime is 664126234423. The next prime is 664126234501. The reversal of 664126234452 is 254432621466.

It is a happy number.

664126234452 is a `hidden beast` number, since 6 + 6 + 4 + 12 + 623 + 4 + 4 + 5 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 654341859396 + 9784375056 = 808914^2 + 98916^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×664126234452³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664126234398 and 664126234407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9223975443 + ... + 9223975514.

Almost surely, 2^664126234452 is an apocalyptic number.

It is an amenable number.

664126234452 is an abundant number, since it is smaller than the sum of its proper divisors (1014637302726).

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

664126234452 is a wasteful number, since it uses less digits than its factorization.

664126234452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18447950967 (or 18447950962 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 45.

The spelling of 664126234452 in words is "six hundred sixty-four billion, one hundred twenty-six million, two hundred thirty-four thousand, four hundred fifty-two".