66405505952 has 12 divisors (see below), whose sum is σ = 130735839906. Its totient is φ = 33202752960.

The previous prime is 66405505949. The next prime is 66405505979. The reversal of 66405505952 is 25950550466.

It can be written as a sum of positive squares in only one way, i.e., 43348905616 + 23056600336 = 208204^2 + 151844^2 .

It is a super-2 number, since 2×66405505952² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66405505897 and 66405505906.

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, 1037585999 + ... + 1037586062.

Almost surely, 2^66405505952 is an apocalyptic number.

It is an amenable number.

66405505952 is a deficient number, since it is larger than the sum of its proper divisors (64330333954).

66405505952 is a wasteful number, since it uses less digits than its factorization.

66405505952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075172071 (or 2075172063 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 66405505952 in words is "sixty-six billion, four hundred five million, five hundred five thousand, nine hundred fifty-two".