61720072370 has 64 divisors (see below), whose sum is σ = 123109410816. Its totient is φ = 22089862080.

The previous prime is 61720072369. The next prime is 61720072373. The reversal of 61720072370 is 7327002716.

It is a self number, because there is not a number n which added to its sum of digits gives 61720072370.

It is not an unprimeable number, because it can be changed into a prime (61720072373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10926887 + ... + 10932533.

It is an arithmetic number, because the mean of its divisors is an integer number (1923584544).

Almost surely, 2^61720072370 is an apocalyptic number.

61720072370 is a deficient number, since it is larger than the sum of its proper divisors (61389338446).

61720072370 is a wasteful number, since it uses less digits than its factorization.

61720072370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7215.

The product of its (nonzero) digits is 24696, while the sum is 35.

The spelling of 61720072370 in words is "sixty-one billion, seven hundred twenty million, seventy-two thousand, three hundred seventy".