61722838889 has 16 divisors (see below), whose sum is σ = 65238810624. Its totient is φ = 58318520400.

The previous prime is 61722838871. The next prime is 61722838921. The reversal of 61722838889 is 98883822716.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 61722838889 - 2²⁴ = 61706061673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61722838819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90572 + ... + 362834.

It is an arithmetic number, because the mean of its divisors is an integer number (4077425664).

Almost surely, 2^61722838889 is an apocalyptic number.

It is an amenable number.

61722838889 is a deficient number, since it is larger than the sum of its proper divisors (3515971735).

61722838889 is a wasteful number, since it uses less digits than its factorization.

61722838889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272468.

The product of its digits is 18579456, while the sum is 62.

The spelling of 61722838889 in words is "sixty-one billion, seven hundred twenty-two million, eight hundred thirty-eight thousand, eight hundred eighty-nine".