66516849054 has 16 divisors (see below), whose sum is σ = 147815220240. Its totient is φ = 22172283000.

The previous prime is 66516849041. The next prime is 66516849097. The reversal of 66516849054 is 45094861566.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 1231793501 = 66516849054 / (6 + 6 + 5 + 1 + 6 + 8 + 4 + 9 + 0 + 5 + 4).

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, 615896697 + ... + 615896804.

It is an arithmetic number, because the mean of its divisors is an integer number (9238451265).

Almost surely, 2^66516849054 is an apocalyptic number.

66516849054 is an abundant number, since it is smaller than the sum of its proper divisors (81298371186).

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

66516849054 is a wasteful number, since it uses less digits than its factorization.

66516849054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231793512 (or 1231793506 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 66516849054 in words is "sixty-six billion, five hundred sixteen million, eight hundred forty-nine thousand, fifty-four".