66551015 has 8 divisors (see below), whose sum is σ = 84064560. Its totient is φ = 50438592.

The previous prime is 66550993. The next prime is 66551041. The reversal of 66551015 is 51015566.

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 66551015 - 2¹⁰ = 66549991 is a prime.

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, 350174 + ... + 350363.

It is an arithmetic number, because the mean of its divisors is an integer number (10508070).

Almost surely, 2^66551015 is an apocalyptic number.

66551015 is a deficient number, since it is larger than the sum of its proper divisors (17513545).

66551015 is a wasteful number, since it uses less digits than its factorization.

66551015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700561.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 66551015 is about 8157.8805458281. The cubic root of 66551015 is about 405.2455250559.

The spelling of 66551015 in words is "sixty-six million, five hundred fifty-one thousand, fifteen".