6661311262406 has 16 divisors (see below), whose sum is σ = 10133103652128. Its totient is φ = 3283613793600.

The previous prime is 6661311262399. The next prime is 6661311262409. The reversal of 6661311262406 is 6042621131666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661311262409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2678546 + ... + 4527386.

It is an arithmetic number, because the mean of its divisors is an integer number (633318978258).

Almost surely, 2^{6661311262406} is an apocalyptic number.

6661311262406 is a deficient number, since it is larger than the sum of its proper divisors (3471792389722).

6661311262406 is a wasteful number, since it uses less digits than its factorization.

6661311262406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874287.

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 6661311262406 in words is "six trillion, six hundred sixty-one billion, three hundred eleven million, two hundred sixty-two thousand, four hundred six".