61155220038 has 32 divisors (see below), whose sum is σ = 133508442240. Its totient is φ = 18520930560.

The previous prime is 61155220031. The next prime is 61155220043. The reversal of 61155220038 is 83002255116.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 61155219990 and 61155220008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61155220031) 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, 161008 + ... + 385011.

It is an arithmetic number, because the mean of its divisors is an integer number (4172138820).

Almost surely, 2^61155220038 is an apocalyptic number.

61155220038 is an abundant number, since it is smaller than the sum of its proper divisors (72353222202).

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

61155220038 is a wasteful number, since it uses less digits than its factorization.

61155220038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547732.

The product of its (nonzero) digits is 14400, while the sum is 33.

The spelling of 61155220038 in words is "sixty-one billion, one hundred fifty-five million, two hundred twenty thousand, thirty-eight".