66507415422 has 64 divisors (see below), whose sum is σ = 154025625600. Its totient is φ = 18751299840.

The previous prime is 66507415399. The next prime is 66507415423. The reversal of 66507415422 is 22451470566.

It is a super-2 number, since 2×66507415422² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66507415423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7656922 + ... + 7665602.

It is an arithmetic number, because the mean of its divisors is an integer number (2406650400).

Almost surely, 2^66507415422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66507415422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77012812800).

66507415422 is an abundant number, since it is smaller than the sum of its proper divisors (87518210178).

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

66507415422 is a wasteful number, since it uses less digits than its factorization.

66507415422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11081.

The product of its (nonzero) digits is 403200, while the sum is 42.

Adding to 66507415422 its reverse (22451470566), we get a palindrome (88958885988).

The spelling of 66507415422 in words is "sixty-six billion, five hundred seven million, four hundred fifteen thousand, four hundred twenty-two".