61215066 has 24 divisors (see below), whose sum is σ = 144690624. Its totient is φ = 18549960.

The previous prime is 61215047. The next prime is 61215067. The reversal of 61215066 is 66051216.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (61215067) 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, 154386 + ... + 154781.

It is an arithmetic number, because the mean of its divisors is an integer number (6028776).

Almost surely, 2^61215066 is an apocalyptic number.

61215066 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

61215066 is an abundant number, since it is smaller than the sum of its proper divisors (83475558).

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

61215066 is a wasteful number, since it uses less digits than its factorization.

61215066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309186 (or 309183 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 61215066 is about 7824.0057515316. The cubic root of 61215066 is about 394.1118022965. Note that the first 3 decimals are identical.

It can be divided in two parts, 612150 and 66, that added together give a palindrome (612216).

The spelling of 61215066 in words is "sixty-one million, two hundred fifteen thousand, sixty-six".