66455940 has 48 divisors (see below), whose sum is σ = 192084480. Its totient is φ = 17149440.

The previous prime is 66455933. The next prime is 66455951. The reversal of 66455940 is 4955466.

It is a super-2 number, since 2×66455940² = 8832783922567200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16005 + ... + 19724.

It is an arithmetic number, because the mean of its divisors is an integer number (4001760).

Almost surely, 2^66455940 is an apocalyptic number.

66455940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66455940 is an abundant number, since it is smaller than the sum of its proper divisors (125628540).

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

66455940 is a wasteful number, since it uses less digits than its factorization.

66455940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35772 (or 35770 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 66455940 is about 8152.0512755993. The cubic root of 66455940 is about 405.0524547209.

The spelling of 66455940 in words is "sixty-six million, four hundred fifty-five thousand, nine hundred forty".