667235502561 has 16 divisors (see below), whose sum is σ = 898089737600. Its totient is φ = 440605018368.

The previous prime is 667235502541. The next prime is 667235502581. The reversal of 667235502561 is 165205532766.

It is an interprime number because it is at equal distance from previous prime (667235502541) and next prime (667235502581).

It is not a de Polignac number, because 667235502561 - 2⁷ = 667235502433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667235502561.

It is not an unprimeable number, because it can be changed into a prime (667235502511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 734820 + ... + 1369098.

It is an arithmetic number, because the mean of its divisors is an integer number (56130608600).

Almost surely, 2^667235502561 is an apocalyptic number.

It is an amenable number.

667235502561 is a deficient number, since it is larger than the sum of its proper divisors (230854235039).

667235502561 is a wasteful number, since it uses less digits than its factorization.

667235502561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637608.

The product of its (nonzero) digits is 2268000, while the sum is 48.

The spelling of 667235502561 in words is "six hundred sixty-seven billion, two hundred thirty-five million, five hundred two thousand, five hundred sixty-one".