10643311161561 has 32 divisors (see below), whose sum is σ = 15811324139520. Its totient is φ = 6323224723200.

The previous prime is 10643311161517. The next prime is 10643311161607. The reversal of 10643311161561 is 16516111334601.

It is not a de Polignac number, because 10643311161561 - 2¹¹ = 10643311159513 is a prime.

It is a super-2 number, since 2×10643311161561² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10643311161061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10593051 + ... + 11554191.

It is an arithmetic number, because the mean of its divisors is an integer number (494103879360).

Almost surely, 2^{10643311161561} is an apocalyptic number.

It is an amenable number.

10643311161561 is a deficient number, since it is larger than the sum of its proper divisors (5168012977959).

10643311161561 is a wasteful number, since it uses less digits than its factorization.

10643311161561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970977.

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 10643311161561 in words is "ten trillion, six hundred forty-three billion, three hundred eleven million, one hundred sixty-one thousand, five hundred sixty-one".