61559916 has 48 divisors (see below), whose sum is σ = 157223808. Its totient is φ = 18592000.

The previous prime is 61559909. The next prime is 61559917. The reversal of 61559916 is 61995516.

It is not an unprimeable number, because it can be changed into a prime (61559917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52351 + ... + 53513.

It is an arithmetic number, because the mean of its divisors is an integer number (3275496).

Almost surely, 2^61559916 is an apocalyptic number.

61559916 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

61559916 is an abundant number, since it is smaller than the sum of its proper divisors (95663892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61559916 is a wasteful number, since it uses less digits than its factorization.

61559916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582 (or 1580 counting only the distinct ones).

The product of its digits is 72900, while the sum is 42.

The square root of 61559916 is about 7846.0127453376. The cubic root of 61559916 is about 394.8504823202.

Subtracting 61559916 from its reverse (61995516), we obtain a square (435600 = 660²).

The spelling of 61559916 in words is "sixty-one million, five hundred fifty-nine thousand, nine hundred sixteen".