61531335543 has 8 divisors (see below), whose sum is σ = 82044025456. Its totient is φ = 41019768000.

The previous prime is 61531335487. The next prime is 61531335617. The reversal of 61531335543 is 34553313516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61531335543 - 2⁹ = 61531335031 is a prime.

It is a super-2 number, since 2×61531335543² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61531333543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143038 + ... + 378843.

It is an arithmetic number, because the mean of its divisors is an integer number (10255503182).

Almost surely, 2^61531335543 is an apocalyptic number.

61531335543 is a deficient number, since it is larger than the sum of its proper divisors (20512689913).

61531335543 is a wasteful number, since it uses less digits than its factorization.

61531335543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561185.

The product of its digits is 243000, while the sum is 39.

The spelling of 61531335543 in words is "sixty-one billion, five hundred thirty-one million, three hundred thirty-five thousand, five hundred forty-three".