667197798 has 16 divisors (see below), whose sum is σ = 1341852480. Its totient is φ = 221156456.

The previous prime is 667197767. The next prime is 667197821. The reversal of 667197798 is 897791766.

It is a happy number.

It is a Curzon number.

It is a congruent number.

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, 309540 + ... + 311687.

It is an arithmetic number, because the mean of its divisors is an integer number (83865780).

Almost surely, 2^667197798 is an apocalyptic number.

667197798 is an abundant number, since it is smaller than the sum of its proper divisors (674654682).

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

667197798 is a wasteful number, since it uses less digits than its factorization.

667197798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621411.

The product of its digits is 8001504, while the sum is 60.

The square root of 667197798 is about 25830.1722410053. The cubic root of 667197798 is about 873.8123961327.

The spelling of 667197798 in words is "six hundred sixty-seven million, one hundred ninety-seven thousand, seven hundred ninety-eight".