66156650 has 24 divisors (see below), whose sum is σ = 140630880. Its totient is φ = 22682160.

The previous prime is 66156617. The next prime is 66156659. The reversal of 66156650 is 5665166.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 66156650.

It is not an unprimeable number, because it can be changed into a prime (66156659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94160 + ... + 94859.

It is an arithmetic number, because the mean of its divisors is an integer number (5859620).

Almost surely, 2^66156650 is an apocalyptic number.

66156650 is an abundant number, since it is smaller than the sum of its proper divisors (74474230).

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

66156650 is a wasteful number, since it uses less digits than its factorization.

66156650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189038 (or 189033 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 66156650 is about 8133.6738316704. The cubic root of 66156650 is about 404.4434768378.

The spelling of 66156650 in words is "sixty-six million, one hundred fifty-six thousand, six hundred fifty".