66451760 has 40 divisors (see below), whose sum is σ = 159833520. Its totient is φ = 25663232.

The previous prime is 66451733. The next prime is 66451823. The reversal of 66451760 is 6715466.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 66451760.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12002 + ... + 16641.

It is an arithmetic number, because the mean of its divisors is an integer number (3995838).

Almost surely, 2^66451760 is an apocalyptic number.

It is an amenable number.

66451760 is an abundant number, since it is smaller than the sum of its proper divisors (93381760).

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

66451760 is a wasteful number, since it uses less digits than its factorization.

66451760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28685 (or 28679 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 66451760 is about 8151.7948943776. The cubic root of 66451760 is about 405.0439621028.

The spelling of 66451760 in words is "sixty-six million, four hundred fifty-one thousand, seven hundred sixty".