61405585689 has 64 divisors (see below), whose sum is σ = 99823104000. Its totient is φ = 32795642880.

The previous prime is 61405585669. The next prime is 61405585741. The reversal of 61405585689 is 98658550416.

It is not a de Polignac number, because 61405585689 - 2⁹ = 61405585177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (61405585609) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18499572 + ... + 18502890.

It is an arithmetic number, because the mean of its divisors is an integer number (1559736000).

Almost surely, 2^61405585689 is an apocalyptic number.

It is an amenable number.

61405585689 is a deficient number, since it is larger than the sum of its proper divisors (38417518311).

61405585689 is a wasteful number, since it uses less digits than its factorization.

61405585689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958.

The product of its (nonzero) digits is 10368000, while the sum is 57.

The spelling of 61405585689 in words is "sixty-one billion, four hundred five million, five hundred eighty-five thousand, six hundred eighty-nine".