667165901 has 4 divisors (see below), whose sum is σ = 706410972. Its totient is φ = 627920832.

The previous prime is 667165897. The next prime is 667165921. The reversal of 667165901 is 109561766.

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

It can be written as a sum of positive squares in 2 ways, for example, as 542843401 + 124322500 = 23299^2 + 11150^2 .

It is a cyclic number.

It is not a de Polignac number, because 667165901 - 2² = 667165897 is a prime.

It is a super-2 number, since 2×667165901² = 890220678914283602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667165921) 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, 19622510 + ... + 19622543.

It is an arithmetic number, because the mean of its divisors is an integer number (176602743).

Almost surely, 2^667165901 is an apocalyptic number.

It is an amenable number.

667165901 is a deficient number, since it is larger than the sum of its proper divisors (39245071).

667165901 is a wasteful number, since it uses less digits than its factorization.

667165901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39245070.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 667165901 is about 25829.5547967827. The cubic root of 667165901 is about 873.7984710077.

The spelling of 667165901 in words is "six hundred sixty-seven million, one hundred sixty-five thousand, nine hundred one".