66651787087232 has 64 divisors (see below), whose sum is σ = 134102520302400. Its totient is φ = 32994708480000.

The previous prime is 66651787087219. The next prime is 66651787087247. The reversal of 66651787087232 is 23278078715666.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418800569 + ... + 418959687.

It is an arithmetic number, because the mean of its divisors is an integer number (2095351879725).

Almost surely, 2^{66651787087232} is an apocalyptic number.

It is an amenable number.

66651787087232 is an abundant number, since it is smaller than the sum of its proper divisors (67450733215168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66651787087232 is a wasteful number, since it uses less digits than its factorization.

66651787087232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191635 (or 191623 counting only the distinct ones).

The product of its (nonzero) digits is 284497920, while the sum is 68.

The spelling of 66651787087232 in words is "sixty-six trillion, six hundred fifty-one billion, seven hundred eighty-seven million, eighty-seven thousand, two hundred thirty-two".