61820066 has 24 divisors (see below), whose sum is σ = 117678096. Its totient is φ = 24085320.

The previous prime is 61820051. The next prime is 61820069. The reversal of 61820066 is 66002816.

It is not an unprimeable number, because it can be changed into a prime (61820069) 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, 27596 + ... + 29751.

It is an arithmetic number, because the mean of its divisors is an integer number (4903254).

Almost surely, 2^61820066 is an apocalyptic number.

61820066 is a deficient number, since it is larger than the sum of its proper divisors (55858030).

61820066 is a wasteful number, since it uses less digits than its factorization.

61820066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57374 (or 57367 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 61820066 is about 7862.5737516414. The cubic root of 61820066 is about 395.4059086479.

The spelling of 61820066 in words is "sixty-one million, eight hundred twenty thousand, sixty-six".