61650815 has 4 divisors (see below), whose sum is σ = 73980984. Its totient is φ = 49320648.

The previous prime is 61650709. The next prime is 61650821. The reversal of 61650815 is 51805616.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61650815 - 2¹⁴ = 61634431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6165077 + ... + 6165086.

It is an arithmetic number, because the mean of its divisors is an integer number (18495246).

Almost surely, 2^61650815 is an apocalyptic number.

61650815 is a deficient number, since it is larger than the sum of its proper divisors (12330169).

61650815 is a wasteful number, since it uses less digits than its factorization.

61650815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12330168.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 61650815 is about 7851.8032960588. The cubic root of 61650815 is about 395.0447313547.

The spelling of 61650815 in words is "sixty-one million, six hundred fifty thousand, eight hundred fifteen".