61155560065 has 16 divisors (see below), whose sum is σ = 74605153536. Its totient is φ = 48112459200.

The previous prime is 61155560057. The next prime is 61155560069. The reversal of 61155560065 is 56006555116.

61155560065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61155560065 - 2³ = 61155560057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61155560069) 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, 1687324 + ... + 1723186.

It is an arithmetic number, because the mean of its divisors is an integer number (4662822096).

Almost surely, 2^61155560065 is an apocalyptic number.

It is an amenable number.

61155560065 is a deficient number, since it is larger than the sum of its proper divisors (13449593471).

61155560065 is a wasteful number, since it uses less digits than its factorization.

61155560065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41520.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 61155560065 in words is "sixty-one billion, one hundred fifty-five million, five hundred sixty thousand, sixty-five".