667866981380 has 24 divisors (see below), whose sum is σ = 1402607826648. Its totient is φ = 267130189568.

The previous prime is 667866981373. The next prime is 667866981427. The reversal of 667866981380 is 83189668766.

It can be written as a sum of positive squares in 4 ways, for example, as 16450114564 + 651416866816 = 128258^2 + 807104^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 667866981380.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 705239 + ... + 1353918.

It is an arithmetic number, because the mean of its divisors is an integer number (58441992777).

Almost surely, 2^667866981380 is an apocalyptic number.

It is an amenable number.

667866981380 is an abundant number, since it is smaller than the sum of its proper divisors (734740845268).

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

667866981380 is a wasteful number, since it uses less digits than its factorization.

667866981380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075383 (or 2075381 counting only the distinct ones).

The product of its (nonzero) digits is 125411328, while the sum is 68.

The spelling of 667866981380 in words is "six hundred sixty-seven billion, eight hundred sixty-six million, nine hundred eighty-one thousand, three hundred eighty".