66428092440 has 64 divisors (see below), whose sum is σ = 221426978400. Its totient is φ = 17714157696.

The previous prime is 66428092439. The next prime is 66428092463. The reversal of 66428092440 is 4429082466.

66428092440 is a `hidden beast` number, since 6 + 6 + 42 + 80 + 92 + 440 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30752667 + ... + 30754826.

Almost surely, 2^66428092440 is an apocalyptic number.

66428092440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66428092440 is an abundant number, since it is smaller than the sum of its proper divisors (154998885960).

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

66428092440 is a wasteful number, since it uses less digits than its factorization.

66428092440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61507513 (or 61507503 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The spelling of 66428092440 in words is "sixty-six billion, four hundred twenty-eight million, ninety-two thousand, four hundred forty".