66551016 has 48 divisors (see below), whose sum is σ = 193544640. Its totient is φ = 19014240.

The previous prime is 66550993. The next prime is 66551041. The reversal of 66551016 is 61015566.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27120 + ... + 29471.

It is an arithmetic number, because the mean of its divisors is an integer number (4032180).

Almost surely, 2^66551016 is an apocalyptic number.

It is an amenable number.

66551016 is an abundant number, since it is smaller than the sum of its proper divisors (126993624).

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

66551016 is a wasteful number, since it uses less digits than its factorization.

66551016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56614 (or 56603 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 66551016 is about 8157.8806071185. The cubic root of 66551016 is about 405.2455270857.

It can be divided in two parts, 665 and 51016, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 66551016 in words is "sixty-six million, five hundred fifty-one thousand, sixteen".