61511816 has 32 divisors (see below), whose sum is σ = 122796000. Its totient is φ = 28803456.

The previous prime is 61511777. The next prime is 61511869. The reversal of 61511816 is 61811516.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11255 + ... + 15801.

It is an arithmetic number, because the mean of its divisors is an integer number (3837375).

Almost surely, 2^61511816 is an apocalyptic number.

It is an amenable number.

61511816 is a deficient number, since it is larger than the sum of its proper divisors (61284184).

61511816 is a wasteful number, since it uses less digits than its factorization.

61511816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4661 (or 4657 counting only the distinct ones).

The product of its digits is 1440, while the sum is 29.

The square root of 61511816 is about 7842.9468951409. The cubic root of 61511816 is about 394.7476163746.

The spelling of 61511816 in words is "sixty-one million, five hundred eleven thousand, eight hundred sixteen".