61543510115443 has 16 divisors (see below), whose sum is σ = 67637406170880. Its totient is φ = 55745114803200.

The previous prime is 61543510115429. The next prime is 61543510115453. The reversal of 61543510115443 is 34451101534516.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61543510115443 is a prime.

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 61543510115443.

It is not an unprimeable number, because it can be changed into a prime (61543510115453) 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, 322503658 + ... + 322694431.

It is an arithmetic number, because the mean of its divisors is an integer number (4227337885680).

Almost surely, 2^{61543510115443} is an apocalyptic number.

61543510115443 is a deficient number, since it is larger than the sum of its proper divisors (6093896055437).

61543510115443 is a wasteful number, since it uses less digits than its factorization.

61543510115443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645198318.

The product of its (nonzero) digits is 432000, while the sum is 43.

Adding to 61543510115443 its reverse (34451101534516), we get a palindrome (95994611649959).

The spelling of 61543510115443 in words is "sixty-one trillion, five hundred forty-three billion, five hundred ten million, one hundred fifteen thousand, four hundred forty-three".