51391780234586 has 32 divisors (see below), whose sum is σ = 86815848024576. Its totient is φ = 22604416128000.

The previous prime is 51391780234583. The next prime is 51391780234621. The reversal of 51391780234586 is 68543208719315.

It is a super-2 number, since 2×51391780234586² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is not an unprimeable number, because it can be changed into a prime (51391780234583) 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, 4740926 + ... + 11191958.

It is an arithmetic number, because the mean of its divisors is an integer number (2712995250768).

It is a 2-persistent number, because it is pandigital, and so is 2⋅51391780234586 = 102783560469172, but 3⋅51391780234586 = 154175340703758 is not.

Almost surely, 2^{51391780234586} is an apocalyptic number.

51391780234586 is a deficient number, since it is larger than the sum of its proper divisors (35424067789990).

51391780234586 is a wasteful number, since it uses less digits than its factorization.

51391780234586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6462758.

The product of its (nonzero) digits is 43545600, while the sum is 62.

The spelling of 51391780234586 in words is "fifty-one trillion, three hundred ninety-one billion, seven hundred eighty million, two hundred thirty-four thousand, five hundred eighty-six".