61518155280 has 80 divisors (see below), whose sum is σ = 190930488000. Its totient is φ = 16385554944.

The previous prime is 61518155267. The next prime is 61518155297. The reversal of 61518155280 is 8255181516.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54471 + ... + 354969.

It is an arithmetic number, because the mean of its divisors is an integer number (2386631100).

Almost surely, 2^61518155280 is an apocalyptic number.

61518155280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61518155280 is an abundant number, since it is smaller than the sum of its proper divisors (129412332720).

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

61518155280 is a wasteful number, since it uses less digits than its factorization.

61518155280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301368 (or 301362 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 42.

The spelling of 61518155280 in words is "sixty-one billion, five hundred eighteen million, one hundred fifty-five thousand, two hundred eighty".