61511505500643 has 96 divisors (see below), whose sum is σ = 97775394275328. Its totient is φ = 34081565184000.

The previous prime is 61511505500563. The next prime is 61511505500659. The reversal of 61511505500643 is 34600550511516.

It is not a de Polignac number, because 61511505500643 - 2⁴² = 57113458989539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61511505500595 and 61511505500604.

It is not an unprimeable number, because it can be changed into a prime (61511305500643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 211929246 + ... + 212219292.

It is an arithmetic number, because the mean of its divisors is an integer number (1018493690368).

Almost surely, 2^{61511505500643} is an apocalyptic number.

61511505500643 is a deficient number, since it is larger than the sum of its proper divisors (36263888774685).

61511505500643 is a wasteful number, since it uses less digits than its factorization.

61511505500643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290733 (or 290716 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 42.

The spelling of 61511505500643 in words is "sixty-one trillion, five hundred eleven billion, five hundred five million, five hundred thousand, six hundred forty-three".