61940578589 has 4 divisors (see below), whose sum is σ = 61963719324. Its totient is φ = 61917437856.

The previous prime is 61940578537. The next prime is 61940578613. The reversal of 61940578589 is 98587504916.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6594252025 + 55346326564 = 81205^2 + 235258^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61940578589 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 (61940578289) 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, 11566352 + ... + 11571705.

It is an arithmetic number, because the mean of its divisors is an integer number (15490929831).

Almost surely, 2^61940578589 is an apocalyptic number.

It is an amenable number.

61940578589 is a deficient number, since it is larger than the sum of its proper divisors (23140735).

61940578589 is a wasteful number, since it uses less digits than its factorization.

61940578589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23140734.

The product of its (nonzero) digits is 21772800, while the sum is 62.

The spelling of 61940578589 in words is "sixty-one billion, nine hundred forty million, five hundred seventy-eight thousand, five hundred eighty-nine".