66115650 has 48 divisors (see below), whose sum is σ = 169632000. Its totient is φ = 17021760.

The previous prime is 66115613. The next prime is 66115663. The reversal of 66115650 is 5651166.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3250 + ... + 11949.

It is an arithmetic number, because the mean of its divisors is an integer number (3534000).

Almost surely, 2^66115650 is an apocalyptic number.

66115650 is an abundant number, since it is smaller than the sum of its proper divisors (103516350).

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

66115650 is a wasteful number, since it uses less digits than its factorization.

66115650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15243 (or 15238 counting only the distinct ones).

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

The square root of 66115650 is about 8131.1530547641. The cubic root of 66115650 is about 404.3599094802.

The spelling of 66115650 in words is "sixty-six million, one hundred fifteen thousand, six hundred fifty".