51155640351 has 6 divisors (see below), whose sum is σ = 73891480520. Its totient is φ = 34103760228.

The previous prime is 51155640343. The next prime is 51155640373. The reversal of 51155640351 is 15304655115.

51155640351 is a `hidden beast` number, since 5 + 1 + 1 + 5 + 5 + 640 + 3 + 5 + 1 = 666.

51155640351 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51155640351 - 2³ = 51155640343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155640311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2841980011 + ... + 2841980028.

Almost surely, 2^51155640351 is an apocalyptic number.

51155640351 is a deficient number, since it is larger than the sum of its proper divisors (22735840169).

51155640351 is a wasteful number, since it uses less digits than its factorization.

51155640351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5683960045 (or 5683960042 counting only the distinct ones).

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

The spelling of 51155640351 in words is "fifty-one billion, one hundred fifty-five million, six hundred forty thousand, three hundred fifty-one".