51551155387 has 2 divisors, whose sum is σ = 51551155388. Its totient is φ = 51551155386.

The previous prime is 51551155303. The next prime is 51551155457. The reversal of 51551155387 is 78355115515.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51551155387 is a prime.

It is not a weakly prime, because it can be changed into another prime (51551455387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25775577693 + 25775577694.

It is an arithmetic number, because the mean of its divisors is an integer number (25775577694).

Almost surely, 2^51551155387 is an apocalyptic number.

51551155387 is a deficient number, since it is larger than the sum of its proper divisors (1).

51551155387 is an equidigital number, since it uses as much as digits as its factorization.

51551155387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 525000, while the sum is 46.

The spelling of 51551155387 in words is "fifty-one billion, five hundred fifty-one million, one hundred fifty-five thousand, three hundred eighty-seven".