254402145220505 has 16 divisors (see below), whose sum is σ = 305604530798544. Its totient is φ = 203307099544320.

The previous prime is 254402145220501. The next prime is 254402145220523. The reversal of 254402145220505 is 505022541204452.

It can be written as a sum of positive squares in 8 ways, for example, as 4132877570704 + 250269267649801 = 2032948^2 + 15819901^2 .

It is not a de Polignac number, because 254402145220505 - 2² = 254402145220501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (254402145220501) 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, 96106079 + ... + 98717691.

It is an arithmetic number, because the mean of its divisors is an integer number (19100283174909).

Almost surely, 2^{254402145220505} is an apocalyptic number.

It is an amenable number.

254402145220505 is a deficient number, since it is larger than the sum of its proper divisors (51202385578039).

254402145220505 is a wasteful number, since it uses less digits than its factorization.

254402145220505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632156.

The product of its (nonzero) digits is 640000, while the sum is 41.

Adding to 254402145220505 its reverse (505022541204452), we get a palindrome (759424686424957).

The spelling of 254402145220505 in words is "two hundred fifty-four trillion, four hundred two billion, one hundred forty-five million, two hundred twenty thousand, five hundred five".