266656997376 has 1120 divisors, whose sum is σ = 1055050520832. Its totient is φ = 64975011840.

The previous prime is 266656997363. The next prime is 266656997377. The reversal of 266656997376 is 673799656662.

It is a happy number.

It is a super-2 number, since 2×266656997376² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266656997377) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 868589415 + ... + 868589721.

Almost surely, 2^266656997376 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 266656997376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (527525260416).

266656997376 is an abundant number, since it is smaller than the sum of its proper divisors (788393523456).

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

266656997376 is a wasteful number, since it uses less digits than its factorization.

266656997376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 347 counting only the distinct ones).

The product of its digits is 925888320, while the sum is 72.

The spelling of 266656997376 in words is "two hundred sixty-six billion, six hundred fifty-six million, nine hundred ninety-seven thousand, three hundred seventy-six".