61644684133924 has 12 divisors (see below), whose sum is σ = 107898112021644. Its totient is φ = 30816652127744.

The previous prime is 61644684133861. The next prime is 61644684133937. The reversal of 61644684133924 is 42933148644616.

It can be written as a sum of positive squares in 2 ways, for example, as 21386166732324 + 40258517401600 = 4624518^2 + 6344960^2 .

It is a super-2 number, since 2×61644684133924² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

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, 1422460429 + ... + 1422503764.

It is an arithmetic number, because the mean of its divisors is an integer number (8991509335137).

Almost surely, 2^{61644684133924} is an apocalyptic number.

It is an amenable number.

61644684133924 is a deficient number, since it is larger than the sum of its proper divisors (46253427887720).

61644684133924 is a wasteful number, since it uses less digits than its factorization.

61644684133924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2844969614 (or 2844969612 counting only the distinct ones).

The product of its digits is 71663616, while the sum is 61.

The spelling of 61644684133924 in words is "sixty-one trillion, six hundred forty-four billion, six hundred eighty-four million, one hundred thirty-three thousand, nine hundred twenty-four".