4278016540261 has 4 divisors (see below), whose sum is σ = 4304262040672. Its totient is φ = 4251771039852.

The previous prime is 4278016540253. The next prime is 4278016540333. The reversal of 4278016540261 is 1620456108724.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4278016540261 - 2³ = 4278016540253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4278016547261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13122749961 + ... + 13122750286.

It is an arithmetic number, because the mean of its divisors is an integer number (1076065510168).

Almost surely, 2^{4278016540261} is an apocalyptic number.

It is an amenable number.

4278016540261 is a deficient number, since it is larger than the sum of its proper divisors (26245500411).

4278016540261 is a wasteful number, since it uses less digits than its factorization.

4278016540261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26245500410.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 4278016540261 in words is "four trillion, two hundred seventy-eight billion, sixteen million, five hundred forty thousand, two hundred sixty-one".