66552540215 has 32 divisors (see below), whose sum is σ = 95439790080. Its totient is φ = 43560468864.

The previous prime is 66552540193. The next prime is 66552540221. The reversal of 66552540215 is 51204525566.

It is a cyclic number.

It is not a de Polignac number, because 66552540215 - 2¹² = 66552536119 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299297 + ... + 471893.

It is an arithmetic number, because the mean of its divisors is an integer number (2982493440).

Almost surely, 2^66552540215 is an apocalyptic number.

66552540215 is a deficient number, since it is larger than the sum of its proper divisors (28887249865).

66552540215 is a wasteful number, since it uses less digits than its factorization.

66552540215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173111.

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 66552540215 in words is "sixty-six billion, five hundred fifty-two million, five hundred forty thousand, two hundred fifteen".