667162057 has 4 divisors (see below), whose sum is σ = 673066260. Its totient is φ = 661257856.

The previous prime is 667162049. The next prime is 667162061. The reversal of 667162057 is 750261766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 750261766 = 2 ⋅375130883.

It can be written as a sum of positive squares in 2 ways, for example, as 288626121 + 378535936 = 16989^2 + 19456^2 .

It is a cyclic number.

It is not a de Polignac number, because 667162057 - 2³ = 667162049 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667162087) 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, 2951932 + ... + 2952157.

It is an arithmetic number, because the mean of its divisors is an integer number (168266565).

Almost surely, 2^667162057 is an apocalyptic number.

It is an amenable number.

667162057 is a deficient number, since it is larger than the sum of its proper divisors (5904203).

667162057 is a wasteful number, since it uses less digits than its factorization.

667162057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5904202.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 667162057 is about 25829.4803857917. The cubic root of 667162057 is about 873.7967928205.

The spelling of 667162057 in words is "six hundred sixty-seven million, one hundred sixty-two thousand, fifty-seven".