660167531 has 2 divisors, whose sum is σ = 660167532. Its totient is φ = 660167530.

The previous prime is 660167491. The next prime is 660167561. The reversal of 660167531 is 135761066.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660167531 - 2⁶ = 660167467 is a prime.

It is a super-2 number, since 2×660167531² = 871642337973271922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 660167491 and 660167500.

It is not a weakly prime, because it can be changed into another prime (660167561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330083765 + 330083766.

It is an arithmetic number, because the mean of its divisors is an integer number (330083766).

Almost surely, 2^660167531 is an apocalyptic number.

660167531 is a deficient number, since it is larger than the sum of its proper divisors (1).

660167531 is an equidigital number, since it uses as much as digits as its factorization.

660167531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 660167531 is about 25693.7255181104. The cubic root of 660167531 is about 870.7324307307.

The spelling of 660167531 in words is "six hundred sixty million, one hundred sixty-seven thousand, five hundred thirty-one".