61654221889 has 48 divisors (see below), whose sum is σ = 71881720704. Its totient is φ = 52731993600.

The previous prime is 61654221887. The next prime is 61654221901. The reversal of 61654221889 is 98812245616.

It is not a de Polignac number, because 61654221889 - 2¹ = 61654221887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61654221883) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15884229 + ... + 15888109.

It is an arithmetic number, because the mean of its divisors is an integer number (1497535848).

Almost surely, 2^61654221889 is an apocalyptic number.

It is an amenable number.

61654221889 is a deficient number, since it is larger than the sum of its proper divisors (10227498815).

61654221889 is a wasteful number, since it uses less digits than its factorization.

61654221889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4058 (or 4045 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 52.

The spelling of 61654221889 in words is "sixty-one billion, six hundred fifty-four million, two hundred twenty-one thousand, eight hundred eighty-nine".