61365371056643 has 4 divisors (see below), whose sum is σ = 61365727687128. Its totient is φ = 61365014426160.

The previous prime is 61365371056603. The next prime is 61365371056667. The reversal of 61365371056643 is 34665017356316.

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

It is a cyclic number.

It is not a de Polignac number, because 61365371056643 - 2¹² = 61365371052547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61365371056603) 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, 178057013 + ... + 178401318.

It is an arithmetic number, because the mean of its divisors is an integer number (15341431921782).

Almost surely, 2^{61365371056643} is an apocalyptic number.

61365371056643 is a deficient number, since it is larger than the sum of its proper divisors (356630485).

61365371056643 is a wasteful number, since it uses less digits than its factorization.

61365371056643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356630484.

The product of its (nonzero) digits is 24494400, while the sum is 56.

The spelling of 61365371056643 in words is "sixty-one trillion, three hundred sixty-five billion, three hundred seventy-one million, fifty-six thousand, six hundred forty-three".