61722783889 has 4 divisors (see below), whose sum is σ = 66470690356. Its totient is φ = 56974877424.

The previous prime is 61722783883. The next prime is 61722783901. The reversal of 61722783889 is 98838722716.

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 21415395600 + 40307388289 = 146340^2 + 200767^2 .

It is a cyclic number.

It is not a de Polignac number, because 61722783889 - 2²⁵ = 61689229457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61722783883) 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, 2373953214 + ... + 2373953239.

It is an arithmetic number, because the mean of its divisors is an integer number (16617672589).

Almost surely, 2^61722783889 is an apocalyptic number.

It is an amenable number.

61722783889 is a deficient number, since it is larger than the sum of its proper divisors (4747906467).

61722783889 is a wasteful number, since it uses less digits than its factorization.

61722783889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4747906466.

The product of its digits is 16257024, while the sum is 61.

The spelling of 61722783889 in words is "sixty-one billion, seven hundred twenty-two million, seven hundred eighty-three thousand, eight hundred eighty-nine".