272240122656781 has 4 divisors (see below), whose sum is σ = 272835834085372. Its totient is φ = 271644411228192.

The previous prime is 272240122656767. The next prime is 272240122656791. The reversal of 272240122656781 is 187656221042272.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 223956163477225 + 48283959179556 = 14965165^2 + 6948666^2 .

It is a cyclic number.

It is not a de Polignac number, because 272240122656781 - 2²³ = 272240114268173 is a prime.

It is a super-2 number, since 2×272240122656781² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (272240122656751) 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, 297855713610 + ... + 297855714523.

It is an arithmetic number, because the mean of its divisors is an integer number (68208958521343).

Almost surely, 2^{272240122656781} is an apocalyptic number.

It is an amenable number.

272240122656781 is a deficient number, since it is larger than the sum of its proper divisors (595711428591).

272240122656781 is an equidigital number, since it uses as much as digits as its factorization.

272240122656781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595711428590.

The product of its (nonzero) digits is 9031680, while the sum is 55.

The spelling of 272240122656781 in words is "two hundred seventy-two trillion, two hundred forty billion, one hundred twenty-two million, six hundred fifty-six thousand, seven hundred eighty-one".