61216813075 has 36 divisors (see below), whose sum is σ = 83701517760. Its totient is φ = 44380177600.

The previous prime is 61216812977. The next prime is 61216813079. The reversal of 61216813075 is 57031861216.

It is a happy number.

It is not a de Polignac number, because 61216813075 - 2⁹ = 61216812563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61216813079) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 927006 + ... + 990844.

It is an arithmetic number, because the mean of its divisors is an integer number (2325042160).

Almost surely, 2^61216813075 is an apocalyptic number.

61216813075 is a deficient number, since it is larger than the sum of its proper divisors (22484704685).

61216813075 is a wasteful number, since it uses less digits than its factorization.

61216813075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64188 (or 64172 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 61216813075 in words is "sixty-one billion, two hundred sixteen million, eight hundred thirteen thousand, seventy-five".