51661561060011 has 16 divisors (see below), whose sum is σ = 80397322988544. Its totient is φ = 28892787947904.

The previous prime is 51661561060003. The next prime is 51661561060013. The reversal of 51661561060011 is 11006016516615.

It is not a de Polignac number, because 51661561060011 - 2³ = 51661561060003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51661561060013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26171002590 + ... + 26171004563.

It is an arithmetic number, because the mean of its divisors is an integer number (5024832686784).

Almost surely, 2^{51661561060011} is an apocalyptic number.

51661561060011 is a deficient number, since it is larger than the sum of its proper divisors (28735761928533).

51661561060011 is a wasteful number, since it uses less digits than its factorization.

51661561060011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52342007210.

The product of its (nonzero) digits is 32400, while the sum is 39.

Adding to 51661561060011 its reverse (11006016516615), we get a palindrome (62667577576626).

The spelling of 51661561060011 in words is "fifty-one trillion, six hundred sixty-one billion, five hundred sixty-one million, sixty thousand, eleven".