61641616 has 10 divisors (see below), whose sum is σ = 119430662. Its totient is φ = 30820800.

The previous prime is 61641611. The next prime is 61641637. The reversal of 61641616 is 61614616.

It can be written as a sum of positive squares in only one way, i.e., 53231616 + 8410000 = 7296^2 + 2900^2 .

It is not an unprimeable number, because it can be changed into a prime (61641611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1926285 + ... + 1926316.

Almost surely, 2^61641616 is an apocalyptic number.

It is an amenable number.

61641616 is a deficient number, since it is larger than the sum of its proper divisors (57789046).

61641616 is a wasteful number, since it uses less digits than its factorization.

61641616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3852609 (or 3852603 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 61641616 is about 7851.2174852057. The cubic root of 61641616 is about 395.0250819943.

Subtracting from 61641616 its reverse (61614616), we obtain a cube (27000 = 30³).

The spelling of 61641616 in words is "sixty-one million, six hundred forty-one thousand, six hundred sixteen".