667251780342 has 64 divisors (see below), whose sum is σ = 1616734162944. Its totient is φ = 179220971520.

The previous prime is 667251780341. The next prime is 667251780343. The reversal of 667251780342 is 243087152766.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (667251780341) and next prime (667251780343).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667251780341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74742 + ... + 1157622.

It is an arithmetic number, because the mean of its divisors is an integer number (25261471296).

Almost surely, 2^667251780342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667251780342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (808367081472).

667251780342 is an abundant number, since it is smaller than the sum of its proper divisors (949482382602).

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

667251780342 is a wasteful number, since it uses less digits than its factorization.

667251780342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083773.

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 667251780342 in words is "six hundred sixty-seven billion, two hundred fifty-one million, seven hundred eighty thousand, three hundred forty-two".