261232541511451 has 4 divisors (see below), whose sum is σ = 261384156453112. Its totient is φ = 261080926569792.

The previous prime is 261232541511421. The next prime is 261232541511481. The reversal of 261232541511451 is 154115145232162.

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

It is an interprime number because it is at equal distance from previous prime (261232541511421) and next prime (261232541511481).

It is a cyclic number.

It is not a de Polignac number, because 261232541511451 - 2⁷ = 261232541511323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261232541511398 and 261232541511407.

It is not an unprimeable number, because it can be changed into a prime (261232541511421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75807468246 + ... + 75807471691.

It is an arithmetic number, because the mean of its divisors is an integer number (65346039113278).

Almost surely, 2^{261232541511451} is an apocalyptic number.

261232541511451 is a deficient number, since it is larger than the sum of its proper divisors (151614941661).

261232541511451 is a wasteful number, since it uses less digits than its factorization.

261232541511451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151614941660.

The product of its digits is 288000, while the sum is 43.

The spelling of 261232541511451 in words is "two hundred sixty-one trillion, two hundred thirty-two billion, five hundred forty-one million, five hundred eleven thousand, four hundred fifty-one".