1066421261406 has 32 divisors (see below), whose sum is σ = 2169073324800. Its totient is φ = 349435736640.

The previous prime is 1066421261401. The next prime is 1066421261407. The reversal of 1066421261406 is 6041621246601.

1066421261406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1066421261406² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066421261401) 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, 15583986 + ... + 15652266.

It is an arithmetic number, because the mean of its divisors is an integer number (67783541400).

Almost surely, 2^{1066421261406} is an apocalyptic number.

1066421261406 is an abundant number, since it is smaller than the sum of its proper divisors (1102652063394).

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

1066421261406 is a wasteful number, since it uses less digits than its factorization.

1066421261406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112464.

The product of its (nonzero) digits is 82944, while the sum is 39.

The spelling of 1066421261406 in words is "one trillion, sixty-six billion, four hundred twenty-one million, two hundred sixty-one thousand, four hundred six".