120511131555 has 32 divisors (see below), whose sum is σ = 197553634560. Its totient is φ = 62707548800.

The previous prime is 120511131553. The next prime is 120511131599. The reversal of 120511131555 is 555131115021.

It is not a de Polignac number, because 120511131555 - 2¹ = 120511131553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (120511131553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 281121 + ... + 565730.

It is an arithmetic number, because the mean of its divisors is an integer number (6173551080).

Almost surely, 2^120511131555 is an apocalyptic number.

120511131555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

120511131555 is a deficient number, since it is larger than the sum of its proper divisors (77042503005).

120511131555 is a wasteful number, since it uses less digits than its factorization.

120511131555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847091.

The product of its (nonzero) digits is 3750, while the sum is 30.

Adding to 120511131555 its reverse (555131115021), we get a palindrome (675642246576).

The spelling of 120511131555 in words is "one hundred twenty billion, five hundred eleven million, one hundred thirty-one thousand, five hundred fifty-five".