66106513412540 has 48 divisors (see below), whose sum is σ = 143614083412800. Its totient is φ = 25530190167552.

The previous prime is 66106513412539. The next prime is 66106513412549. The reversal of 66106513412540 is 4521431560166.

It is a super-2 number, since 2×66106513412540² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66106513412491 and 66106513412500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66106513412549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23711792 + ... + 26352648.

It is an arithmetic number, because the mean of its divisors is an integer number (2991960071100).

Almost surely, 2^{66106513412540} is an apocalyptic number.

It is an amenable number.

66106513412540 is an abundant number, since it is smaller than the sum of its proper divisors (77507570000260).

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

66106513412540 is a wasteful number, since it uses less digits than its factorization.

66106513412540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684054 (or 2684052 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 66106513412540 in words is "sixty-six trillion, one hundred six billion, five hundred thirteen million, four hundred twelve thousand, five hundred forty".