667171940 has 24 divisors (see below), whose sum is σ = 1401623160. Its totient is φ = 266761728.

The previous prime is 667171933. The next prime is 667171943. The reversal of 667171940 is 49171766.

It can be written as a sum of positive squares in 4 ways, for example, as 124188736 + 542983204 = 11144^2 + 23302^2 .

It is not an unprimeable number, because it can be changed into a prime (667171943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61226 + ... + 71294.

It is an arithmetic number, because the mean of its divisors is an integer number (58400965).

Almost surely, 2^667171940 is an apocalyptic number.

It is an amenable number.

667171940 is an abundant number, since it is smaller than the sum of its proper divisors (734451220).

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

667171940 is a wasteful number, since it uses less digits than its factorization.

667171940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13391 (or 13389 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 667171940 is about 25829.6716974878. The cubic root of 667171940 is about 873.8011074599.

The spelling of 667171940 in words is "six hundred sixty-seven million, one hundred seventy-one thousand, nine hundred forty".