51091011780549 has 128 divisors (see below), whose sum is σ = 76334740070400. Its totient is φ = 30202732707840.

The previous prime is 51091011780517. The next prime is 51091011780577. The reversal of 51091011780549 is 94508711019015.

It is not a de Polignac number, because 51091011780549 - 2⁵ = 51091011780517 is a prime.

It is a super-2 number, since 2×51091011780549² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51091011781549) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5089248072 + ... + 5089258110.

It is an arithmetic number, because the mean of its divisors is an integer number (596365156800).

Almost surely, 2^{51091011780549} is an apocalyptic number.

It is an amenable number.

51091011780549 is a deficient number, since it is larger than the sum of its proper divisors (25243728289851).

51091011780549 is a wasteful number, since it uses less digits than its factorization.

51091011780549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10515.

The product of its (nonzero) digits is 453600, while the sum is 51.

The spelling of 51091011780549 in words is "fifty-one trillion, ninety-one billion, eleven million, seven hundred eighty thousand, five hundred forty-nine".