664077418850 has 24 divisors (see below), whose sum is σ = 1237467199188. Its totient is φ = 265139956800.

The previous prime is 664077418817. The next prime is 664077418859. The reversal of 664077418850 is 58814770466.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 185605010761 + 478472408089 = 430819^2 + 691717^2 .

It is not an unprimeable number, because it can be changed into a prime (664077418859) 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 11 ways as a sum of consecutive naturals, for example, 12247949 + ... + 12302048.

Almost surely, 2^664077418850 is an apocalyptic number.

664077418850 is a deficient number, since it is larger than the sum of its proper divisors (573389780338).

664077418850 is a wasteful number, since it uses less digits than its factorization.

664077418850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24550550 (or 24550545 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 56.

The spelling of 664077418850 in words is "six hundred sixty-four billion, seventy-seven million, four hundred eighteen thousand, eight hundred fifty".