61861658075385 has 24 divisors (see below), whose sum is σ = 115138432990656. Its totient is φ = 28279615119840.

The previous prime is 61861658075383. The next prime is 61861658075407. The reversal of 61861658075385 is 58357085616816.

It is not a de Polignac number, because 61861658075385 - 2¹ = 61861658075383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61861658075383) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42082759861 + ... + 42082761330.

It is an arithmetic number, because the mean of its divisors is an integer number (4797434707944).

Almost surely, 2^{61861658075385} is an apocalyptic number.

It is an amenable number.

61861658075385 is a deficient number, since it is larger than the sum of its proper divisors (53276774915271).

61861658075385 is a wasteful number, since it uses less digits than its factorization.

61861658075385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84165521213 (or 84165521206 counting only the distinct ones).

The product of its (nonzero) digits is 290304000, while the sum is 69.

The spelling of 61861658075385 in words is "sixty-one trillion, eight hundred sixty-one billion, six hundred fifty-eight million, seventy-five thousand, three hundred eighty-five".