61123550555 has 16 divisors (see below), whose sum is σ = 73937279520. Its totient is φ = 48507725568.

The previous prime is 61123550519. The next prime is 61123550557. The reversal of 61123550555 is 55505532116.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61123550555 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61123550557) 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, 215864 + ... + 410906.

It is an arithmetic number, because the mean of its divisors is an integer number (4621079970).

Almost surely, 2^61123550555 is an apocalyptic number.

61123550555 is a deficient number, since it is larger than the sum of its proper divisors (12813728965).

61123550555 is a wasteful number, since it uses less digits than its factorization.

61123550555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195550.

The product of its (nonzero) digits is 112500, while the sum is 38.

The spelling of 61123550555 in words is "sixty-one billion, one hundred twenty-three million, five hundred fifty thousand, five hundred fifty-five".