1066943631551 has 4 divisors (see below), whose sum is σ = 1219364150352. Its totient is φ = 914523112752.

The previous prime is 1066943631409. The next prime is 1066943631553. The reversal of 1066943631551 is 1551363496601.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1066943631551 is a prime.

It is a super-2 number, since 2×1066943631551² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1066943631551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066943631553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76210259390 + ... + 76210259403.

It is an arithmetic number, because the mean of its divisors is an integer number (304841037588).

Almost surely, 2^{1066943631551} is an apocalyptic number.

1066943631551 is a deficient number, since it is larger than the sum of its proper divisors (152420518801).

1066943631551 is an equidigital number, since it uses as much as digits as its factorization.

1066943631551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152420518800.

The product of its (nonzero) digits is 1749600, while the sum is 50.

The spelling of 1066943631551 in words is "one trillion, sixty-six billion, nine hundred forty-three million, six hundred thirty-one thousand, five hundred fifty-one".