51158401778 has 16 divisors (see below), whose sum is σ = 88119735840. Its totient is φ = 22029933600.

The previous prime is 51158401757. The next prime is 51158401787. The reversal of 51158401778 is 87710485115.

It is a super-2 number, since 2×51158401778² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61193843 + ... + 61194678.

It is an arithmetic number, because the mean of its divisors is an integer number (5507483490).

Almost surely, 2^51158401778 is an apocalyptic number.

51158401778 is a deficient number, since it is larger than the sum of its proper divisors (36961334062).

51158401778 is a wasteful number, since it uses less digits than its factorization.

51158401778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122388553.

The product of its (nonzero) digits is 313600, while the sum is 47.

The spelling of 51158401778 in words is "fifty-one billion, one hundred fifty-eight million, four hundred one thousand, seven hundred seventy-eight".