667962091 has 4 divisors (see below), whose sum is σ = 671962032. Its totient is φ = 663962152.

The previous prime is 667962077. The next prime is 667962121. The reversal of 667962091 is 190269766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667962091 - 2⁷ = 667961963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667962041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1999720 + ... + 2000053.

It is an arithmetic number, because the mean of its divisors is an integer number (167990508).

Almost surely, 2^667962091 is an apocalyptic number.

667962091 is a deficient number, since it is larger than the sum of its proper divisors (3999941).

667962091 is a wasteful number, since it uses less digits than its factorization.

667962091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999940.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 667962091 is about 25844.9625846121. The cubic root of 667962091 is about 874.1459273329.

The spelling of 667962091 in words is "six hundred sixty-seven million, nine hundred sixty-two thousand, ninety-one".