66531087 has 12 divisors (see below), whose sum is σ = 109829200. Its totient is φ = 38017728.

The previous prime is 66531083. The next prime is 66531097. The reversal of 66531087 is 78013566.

It is not a de Polignac number, because 66531087 - 2² = 66531083 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 (66531083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 527962 + ... + 528087.

Almost surely, 2^66531087 is an apocalyptic number.

66531087 is a deficient number, since it is larger than the sum of its proper divisors (43298113).

66531087 is a wasteful number, since it uses less digits than its factorization.

66531087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056062 (or 1056059 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 66531087 is about 8156.6590587078. The cubic root of 66531087 is about 405.2050721842.

The spelling of 66531087 in words is "sixty-six million, five hundred thirty-one thousand, eighty-seven".