66461320 has 32 divisors (see below), whose sum is σ = 151776000. Its totient is φ = 26186688.

The previous prime is 66461281. The next prime is 66461327. The reversal of 66461320 is 2316466.

It is a super-2 number, since 2×66461320² = 8834214112284800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66461327) 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, 9720 + ... + 15079.

It is an arithmetic number, because the mean of its divisors is an integer number (4743000).

Almost surely, 2^66461320 is an apocalyptic number.

It is an amenable number.

66461320 is an abundant number, since it is smaller than the sum of its proper divisors (85314680).

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

66461320 is a wasteful number, since it uses less digits than its factorization.

66461320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24877 (or 24873 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 66461320 is about 8152.3812472185. The cubic root of 66461320 is about 405.0633848871.

Adding to 66461320 its reverse (2316466), we get a palindrome (68777786).

The spelling of 66461320 in words is "sixty-six million, four hundred sixty-one thousand, three hundred twenty".