811061640169 has 16 divisors (see below), whose sum is σ = 893621082816. Its totient is φ = 729974376000.

The previous prime is 811061640167. The next prime is 811061640173. The reversal of 811061640169 is 961046160118.

It is a cyclic number.

It is not a de Polignac number, because 811061640169 - 2¹ = 811061640167 is a prime.

It is a super-2 number, since 2×811061640169² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (811061640167) 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, 28557394 + ... + 28585780.

It is an arithmetic number, because the mean of its divisors is an integer number (55851317676).

Almost surely, 2^811061640169 is an apocalyptic number.

It is an amenable number.

811061640169 is a deficient number, since it is larger than the sum of its proper divisors (82559442647).

811061640169 is a wasteful number, since it uses less digits than its factorization.

811061640169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54216.

The product of its (nonzero) digits is 62208, while the sum is 43.

The spelling of 811061640169 in words is "eight hundred eleven billion, sixty-one million, six hundred forty thousand, one hundred sixty-nine".