667155705 has 8 divisors (see below), whose sum is σ = 1067449152. Its totient is φ = 355816368.

The previous prime is 667155703. The next prime is 667155737. The reversal of 667155705 is 507551766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 667155705 - 2¹ = 667155703 is a prime.

It is a super-4 number, since 4×667155705⁴ (a number of 36 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (667155703) 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, 22238509 + ... + 22238538.

It is an arithmetic number, because the mean of its divisors is an integer number (133431144).

Almost surely, 2^667155705 is an apocalyptic number.

It is an amenable number.

667155705 is a deficient number, since it is larger than the sum of its proper divisors (400293447).

667155705 is a wasteful number, since it uses less digits than its factorization.

667155705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44477055.

The product of its (nonzero) digits is 220500, while the sum is 42.

The square root of 667155705 is about 25829.3574252245. The cubic root of 667155705 is about 873.7940196938.

The spelling of 667155705 in words is "six hundred sixty-seven million, one hundred fifty-five thousand, seven hundred five".