61081616 has 20 divisors (see below), whose sum is σ = 118471212. Its totient is φ = 30508416.

The previous prime is 61081613. The next prime is 61081619. The reversal of 61081616 is 61618016.

It is an interprime number because it is at equal distance from previous prime (61081613) and next prime (61081619).

It can be written as a sum of positive squares in 2 ways, for example, as 41011216 + 20070400 = 6404^2 + 4480^2 .

It is not an unprimeable number, because it can be changed into a prime (61081613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22610 + ... + 25166.

Almost surely, 2^61081616 is an apocalyptic number.

It is an amenable number.

61081616 is a deficient number, since it is larger than the sum of its proper divisors (57389596).

61081616 is a wasteful number, since it uses less digits than its factorization.

61081616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4058 (or 4052 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 61081616 is about 7815.4728583752. The cubic root of 61081616 is about 393.8252035412.

The spelling of 61081616 in words is "sixty-one million, eighty-one thousand, six hundred sixteen".