66257570442 has 32 divisors (see below), whose sum is σ = 156331229184. Its totient is φ = 18320065200.

The previous prime is 66257570389. The next prime is 66257570443. The reversal of 66257570442 is 24407575266.

It is a junction number, because it is equal to n+sod(n) for n = 66257570391 and 66257570400.

It is not an unprimeable number, because it can be changed into a prime (66257570443) by changing a digit.

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, 25443234 + ... + 25445837.

It is an arithmetic number, because the mean of its divisors is an integer number (4885350912).

Almost surely, 2^66257570442 is an apocalyptic number.

66257570442 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

66257570442 is an abundant number, since it is smaller than the sum of its proper divisors (90073658742).

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

66257570442 is a wasteful number, since it uses less digits than its factorization.

66257570442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50889114.

The product of its (nonzero) digits is 2822400, while the sum is 48.

The spelling of 66257570442 in words is "sixty-six billion, two hundred fifty-seven million, five hundred seventy thousand, four hundred forty-two".