61351506543 has 4 divisors (see below), whose sum is σ = 81802008728. Its totient is φ = 40901004360.

The previous prime is 61351506523. The next prime is 61351506547. The reversal of 61351506543 is 34560515316.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61351506543 - 2⁵ = 61351506511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61351506547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10225251088 + ... + 10225251093.

It is an arithmetic number, because the mean of its divisors is an integer number (20450502182).

Almost surely, 2^61351506543 is an apocalyptic number.

61351506543 is a deficient number, since it is larger than the sum of its proper divisors (20450502185).

61351506543 is a wasteful number, since it uses less digits than its factorization.

61351506543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20450502184.

The product of its (nonzero) digits is 162000, while the sum is 39.

The spelling of 61351506543 in words is "sixty-one billion, three hundred fifty-one million, five hundred six thousand, five hundred forty-three".