61516651 has 16 divisors (see below), whose sum is σ = 73801728. Its totient is φ = 50133600.

The previous prime is 61516649. The next prime is 61516667. The reversal of 61516651 is 15661516.

It is a cyclic number.

It is not a de Polignac number, because 61516651 - 2¹ = 61516649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61516691) 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, 28086 + ... + 30196.

It is an arithmetic number, because the mean of its divisors is an integer number (4612608).

Almost surely, 2^61516651 is an apocalyptic number.

61516651 is a deficient number, since it is larger than the sum of its proper divisors (12285077).

61516651 is a wasteful number, since it uses less digits than its factorization.

61516651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322.

The product of its digits is 5400, while the sum is 31.

The square root of 61516651 is about 7843.2551278152. The cubic root of 61516651 is about 394.7579588575.

The spelling of 61516651 in words is "sixty-one million, five hundred sixteen thousand, six hundred fifty-one".