51687888154 has 32 divisors (see below), whose sum is σ = 93291909120. Its totient is φ = 20981440368.

The previous prime is 51687888121. The next prime is 51687888157. The reversal of 51687888154 is 45188878615.

It is a happy number.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 51687888092 and 51687888101.

It is not an unprimeable number, because it can be changed into a prime (51687888157) 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, 1355619 + ... + 1393225.

It is an arithmetic number, because the mean of its divisors is an integer number (2915372160).

Almost surely, 2^51687888154 is an apocalyptic number.

51687888154 is a deficient number, since it is larger than the sum of its proper divisors (41604020966).

51687888154 is a wasteful number, since it uses less digits than its factorization.

51687888154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42802.

The product of its digits is 17203200, while the sum is 61.

The spelling of 51687888154 in words is "fifty-one billion, six hundred eighty-seven million, eight hundred eighty-eight thousand, one hundred fifty-four".