61409217115 has 4 divisors (see below), whose sum is σ = 73691060544. Its totient is φ = 49127373688.

The previous prime is 61409217101. The next prime is 61409217139. The reversal of 61409217115 is 51171290416.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61409217115 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6140921707 + ... + 6140921716.

It is an arithmetic number, because the mean of its divisors is an integer number (18422765136).

Almost surely, 2^61409217115 is an apocalyptic number.

61409217115 is a deficient number, since it is larger than the sum of its proper divisors (12281843429).

61409217115 is a wasteful number, since it uses less digits than its factorization.

61409217115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12281843428.

The product of its (nonzero) digits is 15120, while the sum is 37.

The spelling of 61409217115 in words is "sixty-one billion, four hundred nine million, two hundred seventeen thousand, one hundred fifteen".