66251213442 has 64 divisors (see below), whose sum is σ = 153854300160. Its totient is φ = 21111188112.

The previous prime is 66251213423. The next prime is 66251213447. The reversal of 66251213442 is 24431215266.

66251213442 is a `hidden beast` number, since 6 + 6 + 2 + 512 + 134 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 66251213397 and 66251213406.

It is not an unprimeable number, because it can be changed into a prime (66251213447) 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 31 ways as a sum of consecutive naturals, for example, 194398 + ... + 412665.

It is an arithmetic number, because the mean of its divisors is an integer number (2403973440).

Almost surely, 2^66251213442 is an apocalyptic number.

66251213442 is an abundant number, since it is smaller than the sum of its proper divisors (87603086718).

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

66251213442 is a wasteful number, since it uses less digits than its factorization.

66251213442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607164 (or 607158 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The spelling of 66251213442 in words is "sixty-six billion, two hundred fifty-one million, two hundred thirteen thousand, four hundred forty-two".