66061380 has 192 divisors, whose sum is σ = 234823680. Its totient is φ = 13478400.

The previous prime is 66061379. The next prime is 66061381. The reversal of 66061380 is 8316066.

It is an interprime number because it is at equal distance from previous prime (66061379) and next prime (66061381).

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

It is not an unprimeable number, because it can be changed into a prime (66061381) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 364890 + ... + 365070.

It is an arithmetic number, because the mean of its divisors is an integer number (1223040).

Almost surely, 2^66061380 is an apocalyptic number.

66061380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66061380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117411840).

66061380 is an abundant number, since it is smaller than the sum of its proper divisors (168762300).

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

66061380 is a wasteful number, since it uses less digits than its factorization.

66061380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 66061380 is about 8127.8152045922. The cubic root of 66061380 is about 404.2492416866.

The spelling of 66061380 in words is "sixty-six million, sixty-one thousand, three hundred eighty".