1555921601136 has 210 divisors, whose sum is σ = 5257762810512. Its totient is φ = 444548865600.

The previous prime is 1555921601119. The next prime is 1555921601239. The reversal of 1555921601136 is 6311061295551.

1555921601136 is a `hidden beast` number, since 1 + 5 + 5 + 5 + 9 + 2 + 1 + 601 + 1 + 36 = 666.

It is a super-2 number, since 2×1555921601136² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1555921601091 and 1555921601100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 789640 + ... + 1932711.

Almost surely, 2^{1555921601136} is an apocalyptic number.

1555921601136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1555921601136 is an abundant number, since it is smaller than the sum of its proper divisors (3701841209376).

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

1555921601136 is an equidigital number, since it uses as much as digits as its factorization.

1555921601136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722391 (or 2722363 counting only the distinct ones).

The product of its (nonzero) digits is 243000, while the sum is 45.

Adding to 1555921601136 its reverse (6311061295551), we get a palindrome (7866982896687).

The spelling of 1555921601136 in words is "one trillion, five hundred fifty-five billion, nine hundred twenty-one million, six hundred one thousand, one hundred thirty-six".