61216720706 has 16 divisors (see below), whose sum is σ = 94800464640. Its totient is φ = 29616842640.

The previous prime is 61216720657. The next prime is 61216720717. The reversal of 61216720706 is 60702761216.

It is a self number, because there is not a number n which added to its sum of digits gives 61216720706.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402500 + ... + 533328.

It is an arithmetic number, because the mean of its divisors is an integer number (5925029040).

Almost surely, 2^61216720706 is an apocalyptic number.

61216720706 is a deficient number, since it is larger than the sum of its proper divisors (33583743934).

61216720706 is a wasteful number, since it uses less digits than its factorization.

61216720706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138409.

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 61216720706 in words is "sixty-one billion, two hundred sixteen million, seven hundred twenty thousand, seven hundred six".