66655501 has 8 divisors (see below), whose sum is σ = 72815904. Its totient is φ = 60511920.

The previous prime is 66655499. The next prime is 66655507. The reversal of 66655501 is 10555666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66655501 - 2¹ = 66655499 is a prime.

It is a super-2 number, since 2×66655501² = 8885911627122002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66655507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4966 + ... + 12568.

It is an arithmetic number, because the mean of its divisors is an integer number (9101988).

Almost surely, 2^66655501 is an apocalyptic number.

It is an amenable number.

66655501 is a deficient number, since it is larger than the sum of its proper divisors (6160403).

66655501 is a wasteful number, since it uses less digits than its factorization.

66655501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8411.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 66655501 is about 8164.2820259959. The cubic root of 66655501 is about 405.4574944943.

The spelling of 66655501 in words is "sixty-six million, six hundred fifty-five thousand, five hundred one".