670663531 has 2 divisors, whose sum is σ = 670663532. Its totient is φ = 670663530.

The previous prime is 670663493. The next prime is 670663547. The reversal of 670663531 is 135366076.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 670663531 - 2⁷ = 670663403 is a prime.

It is a super-2 number, since 2×670663531² = 899579143626775922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (670663571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335331765 + 335331766.

It is an arithmetic number, because the mean of its divisors is an integer number (335331766).

Almost surely, 2^670663531 is an apocalyptic number.

670663531 is a deficient number, since it is larger than the sum of its proper divisors (1).

670663531 is an equidigital number, since it uses as much as digits as its factorization.

670663531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 37.

The square root of 670663531 is about 25897.1722587622. The cubic root of 670663531 is about 875.3227787658.

The spelling of 670663531 in words is "six hundred seventy million, six hundred sixty-three thousand, five hundred thirty-one".