61543434516 has 48 divisors (see below), whose sum is σ = 147711102336. Its totient is φ = 19929089664.

The previous prime is 61543434497. The next prime is 61543434541.

It is a happy number.

61543434516 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180150 + ... + 394386.

It is an arithmetic number, because the mean of its divisors is an integer number (3077314632).

Almost surely, 2^61543434516 is an apocalyptic number.

It is an amenable number.

61543434516 is an abundant number, since it is smaller than the sum of its proper divisors (86167667820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61543434516 is a wasteful number, since it uses less digits than its factorization.

61543434516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214928 (or 214926 counting only the distinct ones).

The product of its digits is 518400, while the sum is 42.

The spelling of 61543434516 in words is "sixty-one billion, five hundred forty-three million, four hundred thirty-four thousand, five hundred sixteen".