61718723 has 4 divisors (see below), whose sum is σ = 67329528. Its totient is φ = 56107920.

The previous prime is 61718719. The next prime is 61718731. The reversal of 61718723 is 32781716.

61718723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 61718723 - 2² = 61718719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61718123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2805386 + ... + 2805407.

It is an arithmetic number, because the mean of its divisors is an integer number (16832382).

Almost surely, 2^61718723 is an apocalyptic number.

61718723 is a deficient number, since it is larger than the sum of its proper divisors (5610805).

61718723 is a wasteful number, since it uses less digits than its factorization.

61718723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5610804.

The product of its digits is 14112, while the sum is 35.

The square root of 61718723 is about 7856.1264628314. The cubic root of 61718723 is about 395.1897245924.

The spelling of 61718723 in words is "sixty-one million, seven hundred eighteen thousand, seven hundred twenty-three".