66453995520 has 768 divisors, whose sum is σ = 267200350560. Its totient is φ = 15099494400.

The previous prime is 66453995501. The next prime is 66453995591. The reversal of 66453995520 is 2559935466.

It is a happy number.

66453995520 is a `hidden beast` number, since 6 + 64 + 53 + 9 + 9 + 5 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (768).

It is a super-2 number, since 2×66453995520² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 275742600 + ... + 275742840.

Almost surely, 2^66453995520 is an apocalyptic number.

66453995520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66453995520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133600175280).

66453995520 is an abundant number, since it is smaller than the sum of its proper divisors (200746355040).

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

66453995520 is a wasteful number, since it uses less digits than its factorization.

66453995520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 8748000, while the sum is 54.

The spelling of 66453995520 in words is "sixty-six billion, four hundred fifty-three million, nine hundred ninety-five thousand, five hundred twenty".