251400065420 has 72 divisors (see below), whose sum is σ = 619569536544. Its totient is φ = 85431489024.

The previous prime is 251400065401. The next prime is 251400065447. The reversal of 251400065420 is 24560004152.

251400065420 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1024352 + ... + 1245831.

It is an arithmetic number, because the mean of its divisors is an integer number (8605132452).

Almost surely, 2^251400065420 is an apocalyptic number.

251400065420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251400065420 is an abundant number, since it is smaller than the sum of its proper divisors (368169471124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251400065420 is a wasteful number, since it uses less digits than its factorization.

251400065420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270319 (or 2270310 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 251400065420 its reverse (24560004152), we get a palindrome (275960069572).

The spelling of 251400065420 in words is "two hundred fifty-one billion, four hundred million, sixty-five thousand, four hundred twenty".