66610250417952 has 144 divisors (see below), whose sum is σ = 196461672825600. Its totient is φ = 22200804663552.

The previous prime is 66610250417939. The next prime is 66610250417999. The reversal of 66610250417952 is 25971405201666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66164049 + ... + 67163247.

It is an arithmetic number, because the mean of its divisors is an integer number (1364317172400).

Almost surely, 2^{66610250417952} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66610250417952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98230836412800).

66610250417952 is an abundant number, since it is smaller than the sum of its proper divisors (129851422407648).

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

66610250417952 is an equidigital number, since it uses as much as digits as its factorization.

66610250417952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007797 (or 1007777 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 66610250417952 in words is "sixty-six trillion, six hundred ten billion, two hundred fifty million, four hundred seventeen thousand, nine hundred fifty-two".