61311702543 has 32 divisors (see below), whose sum is σ = 100725413376. Its totient is φ = 32304451968.

The previous prime is 61311702533. The next prime is 61311702593. The reversal of 61311702543 is 34520711316.

It is a Cunningham number, because it is equal to 247612²-1.

It is not a de Polignac number, because 61311702543 - 2⁴ = 61311702527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61311702533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 123805 + ... + 371417.

It is an arithmetic number, because the mean of its divisors is an integer number (3147669168).

Almost surely, 2^61311702543 is an apocalyptic number.

61311702543 is a deficient number, since it is larger than the sum of its proper divisors (39413710833).

61311702543 is a wasteful number, since it uses less digits than its factorization.

61311702543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248543.

The product of its (nonzero) digits is 15120, while the sum is 33.

The spelling of 61311702543 in words is "sixty-one billion, three hundred eleven million, seven hundred two thousand, five hundred forty-three".