667222278456 has 192 divisors, whose sum is σ = 1792743926400. Its totient is φ = 206335164672.

The previous prime is 667222278413. The next prime is 667222278493. The reversal of 667222278456 is 654872222766.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 667222278396 and 667222278405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 610449846 + ... + 610450938.

It is an arithmetic number, because the mean of its divisors is an integer number (9337207950).

Almost surely, 2^667222278456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667222278456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (896371963200).

667222278456 is an abundant number, since it is smaller than the sum of its proper divisors (1125521647944).

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

667222278456 is a wasteful number, since it uses less digits than its factorization.

667222278456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458 (or 1327 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 57.

The spelling of 667222278456 in words is "six hundred sixty-seven billion, two hundred twenty-two million, two hundred seventy-eight thousand, four hundred fifty-six".