51661105060551 has 8 divisors (see below), whose sum is σ = 78721683901824. Its totient is φ = 29520631463160.

The previous prime is 51661105060511. The next prime is 51661105060573. The reversal of 51661105060551 is 15506050116615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51661105060551 - 2⁷ = 51661105060423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51661105060511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1230026310945 + ... + 1230026310986.

It is an arithmetic number, because the mean of its divisors is an integer number (9840210487728).

Almost surely, 2^{51661105060551} is an apocalyptic number.

51661105060551 is a deficient number, since it is larger than the sum of its proper divisors (27060578841273).

51661105060551 is a wasteful number, since it uses less digits than its factorization.

51661105060551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460052621941.

The product of its (nonzero) digits is 135000, while the sum is 42.

The spelling of 51661105060551 in words is "fifty-one trillion, six hundred sixty-one billion, one hundred five million, sixty thousand, five hundred fifty-one".