66244315453650 has 192 divisors, whose sum is σ = 193311606015360. Its totient is φ = 16623093196800.

The previous prime is 66244315453643. The next prime is 66244315453669. The reversal of 66244315453650 is 5635451344266.

66244315453650 is a `hidden beast` number, since 6 + 6 + 2 + 4 + 4 + 3 + 1 + 54 + 536 + 50 = 666.

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 95 ways as a sum of consecutive naturals, for example, 131412585 + ... + 131915715.

It is an arithmetic number, because the mean of its divisors is an integer number (1006831281330).

Almost surely, 2^{66244315453650} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66244315453650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96655803007680).

66244315453650 is an abundant number, since it is smaller than the sum of its proper divisors (127067290561710).

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

66244315453650 is a wasteful number, since it uses less digits than its factorization.

66244315453650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508906 (or 508895 counting only the distinct ones).

The product of its (nonzero) digits is 31104000, while the sum is 54.

The spelling of 66244315453650 in words is "sixty-six trillion, two hundred forty-four billion, three hundred fifteen million, four hundred fifty-three thousand, six hundred fifty".