266696388972 has 168 divisors, whose sum is σ = 771115399824. Its totient is φ = 80151555456.

The previous prime is 266696388953. The next prime is 266696388997. The reversal of 266696388972 is 279883696662.

It is a super-2 number, since 2×266696388972² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 266696388972.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1548238 + ... + 1711850.

It is an arithmetic number, because the mean of its divisors is an integer number (4589972618).

Almost surely, 2^266696388972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266696388972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (385557699912).

266696388972 is an abundant number, since it is smaller than the sum of its proper divisors (504419010852).

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

266696388972 is a wasteful number, since it uses less digits than its factorization.

266696388972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163691 (or 163674 counting only the distinct ones).

The product of its digits is 564350976, while the sum is 72.

The spelling of 266696388972 in words is "two hundred sixty-six billion, six hundred ninety-six million, three hundred eighty-eight thousand, nine hundred seventy-two".