61220564745 has 16 divisors (see below), whose sum is σ = 98903905152. Its totient is φ = 32333967360.

The previous prime is 61220564731. The next prime is 61220564749. The reversal of 61220564745 is 54746502216.

It is a de Polignac number, because none of the positive numbers 2^k-61220564745 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61220564697 and 61220564706.

It is not an unprimeable number, because it can be changed into a prime (61220564749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19810936 + ... + 19814025.

It is an arithmetic number, because the mean of its divisors is an integer number (6181494072).

Almost surely, 2^61220564745 is an apocalyptic number.

It is an amenable number.

61220564745 is a deficient number, since it is larger than the sum of its proper divisors (37683340407).

61220564745 is a wasteful number, since it uses less digits than its factorization.

61220564745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39625072.

The product of its (nonzero) digits is 403200, while the sum is 42.

The spelling of 61220564745 in words is "sixty-one billion, two hundred twenty million, five hundred sixty-four thousand, seven hundred forty-five".