251145150646 has 16 divisors (see below), whose sum is σ = 406220878224. Its totient is φ = 115763184864.

The previous prime is 251145150643. The next prime is 251145150673. The reversal of 251145150646 is 646051541152.

It is a junction number, because it is equal to n+sod(n) for n = 251145150599 and 251145150608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251145150643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6227916 + ... + 6268111.

It is an arithmetic number, because the mean of its divisors is an integer number (25388804889).

Almost surely, 2^251145150646 is an apocalyptic number.

251145150646 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

251145150646 is a deficient number, since it is larger than the sum of its proper divisors (155075727578).

251145150646 is a wasteful number, since it uses less digits than its factorization.

251145150646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12496815.

The product of its (nonzero) digits is 144000, while the sum is 40.

Adding to 251145150646 its reverse (646051541152), we get a palindrome (897196691798).

The spelling of 251145150646 in words is "two hundred fifty-one billion, one hundred forty-five million, one hundred fifty thousand, six hundred forty-six".