61413216644 has 36 divisors (see below), whose sum is σ = 116514110412. Its totient is φ = 28156305600.

The previous prime is 61413216629. The next prime is 61413216673. The reversal of 61413216644 is 44661231416.

It can be written as a sum of positive squares in 2 ways, for example, as 10792716544 + 50620500100 = 103888^2 + 224990^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61413216598 and 61413216607.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1159754 + ... + 1211550.

It is an arithmetic number, because the mean of its divisors is an integer number (3236503067).

Almost surely, 2^61413216644 is an apocalyptic number.

It is an amenable number.

61413216644 is a deficient number, since it is larger than the sum of its proper divisors (55100893768).

61413216644 is a wasteful number, since it uses less digits than its factorization.

61413216644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52116 (or 51963 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The spelling of 61413216644 in words is "sixty-one billion, four hundred thirteen million, two hundred sixteen thousand, six hundred forty-four".