667212087531 has 16 divisors (see below), whose sum is σ = 1012685541120. Its totient is φ = 386789615520.

The previous prime is 667212087497. The next prime is 667212087539. The reversal of 667212087531 is 135780212766.

It is not a de Polignac number, because 667212087531 - 2¹⁵ = 667212054763 is a prime.

It is a super-2 number, since 2×667212087531² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667212087539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 439532896 + ... + 439534413.

It is an arithmetic number, because the mean of its divisors is an integer number (63292846320).

Almost surely, 2^667212087531 is an apocalyptic number.

667212087531 is a deficient number, since it is larger than the sum of its proper divisors (345473453589).

667212087531 is a wasteful number, since it uses less digits than its factorization.

667212087531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879067346.

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 667212087531 in words is "six hundred sixty-seven billion, two hundred twelve million, eighty-seven thousand, five hundred thirty-one".