251645560545 has 16 divisors (see below), whose sum is σ = 404360940672. Its totient is φ = 133634951040.

The previous prime is 251645560531. The next prime is 251645560571. The reversal of 251645560545 is 545065546152.

It is not a de Polignac number, because 251645560545 - 2⁷ = 251645560417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251645560494 and 251645560503.

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, 35997301 + ... + 36004290.

It is an arithmetic number, because the mean of its divisors is an integer number (25272558792).

Almost surely, 2^251645560545 is an apocalyptic number.

It is an amenable number.

251645560545 is a deficient number, since it is larger than the sum of its proper divisors (152715380127).

251645560545 is a wasteful number, since it uses less digits than its factorization.

251645560545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72001832.

The product of its (nonzero) digits is 3600000, while the sum is 48.

The spelling of 251645560545 in words is "two hundred fifty-one billion, six hundred forty-five million, five hundred sixty thousand, five hundred forty-five".