664581416950 has 48 divisors (see below), whose sum is σ = 1348586827776. Its totient is φ = 241649712800.

The previous prime is 664581416903. The next prime is 664581416951. The reversal of 664581416950 is 59614185466.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a junction number, because it is equal to n+sod(n) for n = 664581416891 and 664581416900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664581416951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10739799 + ... + 10801501.

It is an arithmetic number, because the mean of its divisors is an integer number (28095558912).

Almost surely, 2^664581416950 is an apocalyptic number.

664581416950 is an abundant number, since it is smaller than the sum of its proper divisors (684005410826).

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

664581416950 is a wasteful number, since it uses less digits than its factorization.

664581416950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81309 (or 81304 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 664581416950 in words is "six hundred sixty-four billion, five hundred eighty-one million, four hundred sixteen thousand, nine hundred fifty".