20111551344513 has 32 divisors (see below), whose sum is σ = 30165579360000. Its totient is φ = 13241250228096.

The previous prime is 20111551344503. The next prime is 20111551344523. The reversal of 20111551344513 is 31544315511102.

20111551344513 is a `hidden beast` number, since 2 + 0 + 1 + 1 + 1 + 5 + 5 + 134 + 4 + 513 = 666.

It is an interprime number because it is at equal distance from previous prime (20111551344503) and next prime (20111551344523).

It is not a de Polignac number, because 20111551344513 - 2¹² = 20111551340417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20111551344503) 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, 2971578 + ... + 7003811.

It is an arithmetic number, because the mean of its divisors is an integer number (942674355000).

Almost surely, 2^{20111551344513} is an apocalyptic number.

It is an amenable number.

20111551344513 is a deficient number, since it is larger than the sum of its proper divisors (10054028015487).

20111551344513 is an equidigital number, since it uses as much as digits as its factorization.

20111551344513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9976326 (or 9976320 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 20111551344513 its reverse (31544315511102), we get a palindrome (51655866855615).

The spelling of 20111551344513 in words is "twenty trillion, one hundred eleven billion, five hundred fifty-one million, three hundred forty-four thousand, five hundred thirteen".