61275660018 has 32 divisors (see below), whose sum is σ = 123976630080. Its totient is φ = 20187847680.

The previous prime is 61275660011. The next prime is 61275660029. The reversal of 61275660018 is 81006657216.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61275660011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1437346 + ... + 1479362.

It is an arithmetic number, because the mean of its divisors is an integer number (3874269690).

Almost surely, 2^61275660018 is an apocalyptic number.

61275660018 is an abundant number, since it is smaller than the sum of its proper divisors (62700970062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61275660018 is a wasteful number, since it uses less digits than its factorization.

61275660018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44842.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 61275660018 in words is "sixty-one billion, two hundred seventy-five million, six hundred sixty thousand, eighteen".