666666436074072 has 64 divisors (see below), whose sum is σ = 1904825201990400. Its totient is φ = 190469728986240.

The previous prime is 666666436074031. The next prime is 666666436074077. The reversal of 666666436074072 is 270470634666666.

It is a super-2 number, since 2×666666436074072² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666666436073988 and 666666436074006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666666436074077) 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, 61601454 + ... + 71610557.

It is an arithmetic number, because the mean of its divisors is an integer number (29762893781100).

Almost surely, 2^{666666436074072} is an apocalyptic number.

It is an amenable number.

666666436074072 is an abundant number, since it is smaller than the sum of its proper divisors (1238158765916328).

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

666666436074072 is a wasteful number, since it uses less digits than its factorization.

666666436074072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133241816 (or 133241812 counting only the distinct ones).

The product of its (nonzero) digits is 1316818944, while the sum is 69.

The spelling of 666666436074072 in words is "six hundred sixty-six trillion, six hundred sixty-six billion, four hundred thirty-six million, seventy-four thousand, seventy-two".