667251802056 has 128 divisors (see below), whose sum is σ = 1959196412160. Its totient is φ = 185373619200.

The previous prime is 667251802037. The next prime is 667251802123. The reversal of 667251802056 is 650208152766.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 667251801996 and 667251802014.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10043026 + ... + 10109246.

It is an arithmetic number, because the mean of its divisors is an integer number (15306221970).

Almost surely, 2^667251802056 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 667251802056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (979598206080).

667251802056 is an abundant number, since it is smaller than the sum of its proper divisors (1291944610104).

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

667251802056 is a wasteful number, since it uses less digits than its factorization.

667251802056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67895 (or 67891 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 48.

The spelling of 667251802056 in words is "six hundred sixty-seven billion, two hundred fifty-one million, eight hundred two thousand, fifty-six".