61155229824 has 128 divisors (see below), whose sum is σ = 194377075200. Its totient is φ = 18816979968.

The previous prime is 61155229799. The next prime is 61155229829. The reversal of 61155229824 is 42892255116.

61155229824 is a `hidden beast` number, since 6 + 1 + 1 + 552 + 2 + 98 + 2 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 61155229824.

It is not an unprimeable number, because it can be changed into a prime (61155229829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 635664 + ... + 725519.

It is an arithmetic number, because the mean of its divisors is an integer number (1518570900).

Almost surely, 2^61155229824 is an apocalyptic number.

61155229824 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61155229824 is an abundant number, since it is smaller than the sum of its proper divisors (133221845376).

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

61155229824 is a wasteful number, since it uses less digits than its factorization.

61155229824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361219 (or 1361201 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The spelling of 61155229824 in words is "sixty-one billion, one hundred fifty-five million, two hundred twenty-nine thousand, eight hundred twenty-four".