667428168402 has 24 divisors (see below), whose sum is σ = 1485177997836. Its totient is φ = 216463189536.

The previous prime is 667428168349. The next prime is 667428168553. The reversal of 667428168402 is 204861824766.

It is a happy number.

667428168402 is a `hidden beast` number, since 6 + 6 + 74 + 2 + 8 + 168 + 402 = 666.

667428168402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 656911871001 + 10516297401 = 810501^2 + 102549^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 501071533 + ... + 501072864.

Almost surely, 2^667428168402 is an apocalyptic number.

667428168402 is an abundant number, since it is smaller than the sum of its proper divisors (817749829434).

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

667428168402 is a wasteful number, since it uses less digits than its factorization.

667428168402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002144442 (or 1002144439 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 54.

The spelling of 667428168402 in words is "six hundred sixty-seven billion, four hundred twenty-eight million, one hundred sixty-eight thousand, four hundred two".