251113121545 has 16 divisors (see below), whose sum is σ = 354016821312. Its totient is φ = 168579437760.

The previous prime is 251113121507. The next prime is 251113121569. The reversal of 251113121545 is 545121311152.

It is not a de Polignac number, because 251113121545 - 2²³ = 251104732937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175602867 + ... + 175604296.

It is an arithmetic number, because the mean of its divisors is an integer number (22126051332).

Almost surely, 2^251113121545 is an apocalyptic number.

It is an amenable number.

251113121545 is a deficient number, since it is larger than the sum of its proper divisors (102903699767).

251113121545 is a wasteful number, since it uses less digits than its factorization.

251113121545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351207192.

The product of its digits is 6000, while the sum is 31.

Adding to 251113121545 its reverse (545121311152), we get a palindrome (796234432697).

The spelling of 251113121545 in words is "two hundred fifty-one billion, one hundred thirteen million, one hundred twenty-one thousand, five hundred forty-five".