668532071 has 4 divisors (see below), whose sum is σ = 668600592. Its totient is φ = 668463552.

The previous prime is 668532023. The next prime is 668532077. The reversal of 668532071 is 170235866.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 170235866 = 2 ⋅85117933.

It is a cyclic number.

It is not a de Polignac number, because 668532071 - 2²² = 664337767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668532077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16586 + ... + 40151.

It is an arithmetic number, because the mean of its divisors is an integer number (167150148).

Almost surely, 2^668532071 is an apocalyptic number.

668532071 is a deficient number, since it is larger than the sum of its proper divisors (68521).

668532071 is a wasteful number, since it uses less digits than its factorization.

668532071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68520.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 668532071 is about 25855.9871403124. The cubic root of 668532071 is about 874.3944963509.

The spelling of 668532071 in words is "six hundred sixty-eight million, five hundred thirty-two thousand, seventy-one".