20013051555261 has 24 divisors (see below), whose sum is σ = 29051151143040. Its totient is φ = 13275974801376.

The previous prime is 20013051555221. The next prime is 20013051555281. The reversal of 20013051555261 is 16255515031002.

20013051555261 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 30 + 5 + 15 + 552 + 61 = 666.

It is not a de Polignac number, because 20013051555261 - 2⁶ = 20013051555197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013051555221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3549921 + ... + 7254518.

It is an arithmetic number, because the mean of its divisors is an integer number (1210464630960).

Almost surely, 2^{20013051555261} is an apocalyptic number.

It is an amenable number.

20013051555261 is a deficient number, since it is larger than the sum of its proper divisors (9038099587779).

20013051555261 is a wasteful number, since it uses less digits than its factorization.

20013051555261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10805465 (or 10805462 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

Adding to 20013051555261 its reverse (16255515031002), we get a palindrome (36268566586263).

The spelling of 20013051555261 in words is "twenty trillion, thirteen billion, fifty-one million, five hundred fifty-five thousand, two hundred sixty-one".