66451476 has 144 divisors (see below), whose sum is σ = 199385088. Its totient is φ = 16848000.

The previous prime is 66451459. The next prime is 66451501. The reversal of 66451476 is 67415466.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 440001 + ... + 440151.

Almost surely, 2^66451476 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 66451476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99692544).

66451476 is an abundant number, since it is smaller than the sum of its proper divisors (132933612).

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

66451476 is a wasteful number, since it uses less digits than its factorization.

66451476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 207 counting only the distinct ones).

The product of its digits is 120960, while the sum is 39.

The square root of 66451476 is about 8151.7774748824. Note that the first 3 decimals coincide. The cubic root of 66451476 is about 405.0433850794.

The spelling of 66451476 in words is "sixty-six million, four hundred fifty-one thousand, four hundred seventy-six".