66515672 has 8 divisors (see below), whose sum is σ = 124716900. Its totient is φ = 33257832.

The previous prime is 66515641. The next prime is 66515699. The reversal of 66515672 is 27651566.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×66515672³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4157222 + ... + 4157237.

Almost surely, 2^66515672 is an apocalyptic number.

It is an amenable number.

66515672 is a deficient number, since it is larger than the sum of its proper divisors (58201228).

66515672 is a wasteful number, since it uses less digits than its factorization.

66515672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8314465 (or 8314461 counting only the distinct ones).

The product of its digits is 75600, while the sum is 38.

The square root of 66515672 is about 8155.7140705152. The cubic root of 66515672 is about 405.1737749418.

The spelling of 66515672 in words is "sixty-six million, five hundred fifteen thousand, six hundred seventy-two".