61316815611 has 4 divisors (see below), whose sum is σ = 81755754152. Its totient is φ = 40877877072.

The previous prime is 61316815607. The next prime is 61316815613. The reversal of 61316815611 is 11651861316.

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

It is not a de Polignac number, because 61316815611 - 2² = 61316815607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61316815611.

It is not an unprimeable number, because it can be changed into a prime (61316815613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10219469266 + ... + 10219469271.

It is an arithmetic number, because the mean of its divisors is an integer number (20438938538).

Almost surely, 2^61316815611 is an apocalyptic number.

61316815611 is a deficient number, since it is larger than the sum of its proper divisors (20438938541).

61316815611 is a wasteful number, since it uses less digits than its factorization.

61316815611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20438938540.

The product of its digits is 25920, while the sum is 39.

The spelling of 61316815611 in words is "sixty-one billion, three hundred sixteen million, eight hundred fifteen thousand, six hundred eleven".