61820885615 has 8 divisors (see below), whose sum is σ = 74190038640. Its totient is φ = 49453391232.

The previous prime is 61820885603. The next prime is 61820885617. The reversal of 61820885615 is 51658802816.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61820885615 - 2⁸ = 61820885359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61820885617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331130 + ... + 482999.

It is an arithmetic number, because the mean of its divisors is an integer number (9273754830).

Almost surely, 2^61820885615 is an apocalyptic number.

61820885615 is a deficient number, since it is larger than the sum of its proper divisors (12369153025).

61820885615 is a wasteful number, since it uses less digits than its factorization.

61820885615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829321.

The product of its (nonzero) digits is 921600, while the sum is 50.

The spelling of 61820885615 in words is "sixty-one billion, eight hundred twenty million, eight hundred eighty-five thousand, six hundred fifteen".