261451055536077 has 16 divisors (see below), whose sum is σ = 382094778286080. Its totient is φ = 157704212727600.

The previous prime is 261451055535893. The next prime is 261451055536079. The reversal of 261451055536077 is 770635550154162.

It is a happy number.

It is not a de Polignac number, because 261451055536077 - 2¹¹ = 261451055534029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261451055536079) 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, 18774304077 + ... + 18774318002.

It is an arithmetic number, because the mean of its divisors is an integer number (23880923642880).

Almost surely, 2^{261451055536077} is an apocalyptic number.

It is an amenable number.

261451055536077 is a deficient number, since it is larger than the sum of its proper divisors (120643722750003).

261451055536077 is a wasteful number, since it uses less digits than its factorization.

261451055536077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37548622304.

The product of its (nonzero) digits is 26460000, while the sum is 57.

The spelling of 261451055536077 in words is "two hundred sixty-one trillion, four hundred fifty-one billion, fifty-five million, five hundred thirty-six thousand, seventy-seven".