66451080 has 32 divisors (see below), whose sum is σ = 199353600. Its totient is φ = 17720256.

The previous prime is 66451067. The next prime is 66451081. The reversal of 66451080 is 8015466.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (66451081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276760 + ... + 276999.

It is an arithmetic number, because the mean of its divisors is an integer number (6229800).

Almost surely, 2^66451080 is an apocalyptic number.

66451080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66451080 is an abundant number, since it is smaller than the sum of its proper divisors (132902520).

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

66451080 is a wasteful number, since it uses less digits than its factorization.

66451080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553773 (or 553769 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 66451080 is about 8151.7531856650. The cubic root of 66451080 is about 405.0425804949.

The spelling of 66451080 in words is "sixty-six million, four hundred fifty-one thousand, eighty".