66610051416 has 384 divisors, whose sum is σ = 200558592000. Its totient is φ = 19905177600.

The previous prime is 66610051411. The next prime is 66610051451. The reversal of 66610051416 is 61415001666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66610051411) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 278703025 + ... + 278703263.

It is an arithmetic number, because the mean of its divisors is an integer number (522288000).

Almost surely, 2^66610051416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66610051416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100279296000).

66610051416 is an abundant number, since it is smaller than the sum of its proper divisors (133948540584).

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

66610051416 is a wasteful number, since it uses less digits than its factorization.

66610051416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 66610051416 in words is "sixty-six billion, six hundred ten million, fifty-one thousand, four hundred sixteen".