667285634690 has 16 divisors (see below), whose sum is σ = 1204334294328. Its totient is φ = 266198664576.

The previous prime is 667285634683. The next prime is 667285634699. The reversal of 667285634690 is 96436582766.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 661663484329 + 5622150361 = 813427^2 + 74981^2 .

It is a super-2 number, since 2×667285634690² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667285634699) 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, 89444747 + ... + 89452206.

Almost surely, 2^667285634690 is an apocalyptic number.

667285634690 is a deficient number, since it is larger than the sum of its proper divisors (537048659638).

667285634690 is a wasteful number, since it uses less digits than its factorization.

667285634690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178897333.

The product of its (nonzero) digits is 78382080, while the sum is 62.

The spelling of 667285634690 in words is "six hundred sixty-seven billion, two hundred eighty-five million, six hundred thirty-four thousand, six hundred ninety".