261533524745101 has 24 divisors (see below), whose sum is σ = 310707915465600. Its totient is φ = 219400572125952.

The previous prime is 261533524745099. The next prime is 261533524745131. The reversal of 261533524745101 is 101547425335162.

It is not a de Polignac number, because 261533524745101 - 2¹ = 261533524745099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261533524745131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 515694550 + ... + 516201448.

It is an arithmetic number, because the mean of its divisors is an integer number (12946163144400).

Almost surely, 2^{261533524745101} is an apocalyptic number.

It is an amenable number.

261533524745101 is a deficient number, since it is larger than the sum of its proper divisors (49174390720499).

261533524745101 is a wasteful number, since it uses less digits than its factorization.

261533524745101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730993 (or 730986 counting only the distinct ones).

The product of its (nonzero) digits is 3024000, while the sum is 49.

The spelling of 261533524745101 in words is "two hundred sixty-one trillion, five hundred thirty-three billion, five hundred twenty-four million, seven hundred forty-five thousand, one hundred one".