1555501661560 has 64 divisors (see below), whose sum is σ = 4363485189120. Its totient is φ = 484831685760.

The previous prime is 1555501661521. The next prime is 1555501661603. The reversal of 1555501661560 is 651661055551.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1555501661560.

It is a congruent number.

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, 252513424 + ... + 252519583.

It is an arithmetic number, because the mean of its divisors is an integer number (68179456080).

Almost surely, 2^{1555501661560} is an apocalyptic number.

1555501661560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555501661560 is an abundant number, since it is smaller than the sum of its proper divisors (2807983527560).

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

1555501661560 is a wasteful number, since it uses less digits than its factorization.

1555501661560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505033036 (or 505033032 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 46.

The spelling of 1555501661560 in words is "one trillion, five hundred fifty-five billion, five hundred one million, six hundred sixty-one thousand, five hundred sixty".