66116550 has 48 divisors (see below), whose sum is σ = 164543040. Its totient is φ = 17569440.

The previous prime is 66116543. The next prime is 66116551. The reversal of 66116550 is 5561166.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66116551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56269 + ... + 57431.

It is an arithmetic number, because the mean of its divisors is an integer number (3427980).

Almost surely, 2^66116550 is an apocalyptic number.

66116550 is an abundant number, since it is smaller than the sum of its proper divisors (98426490).

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

66116550 is a wasteful number, since it uses less digits than its factorization.

66116550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 1552 counting only the distinct ones).

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

The square root of 66116550 is about 8131.2083972802. The cubic root of 66116550 is about 404.3617442564.

It can be divided in two parts, 66116 and 550, that added together give a palindrome (66666).

The spelling of 66116550 in words is "sixty-six million, one hundred sixteen thousand, five hundred fifty".