261534253054541 has 16 divisors (see below), whose sum is σ = 271762737447936. Its totient is φ = 251417811600000.

The previous prime is 261534253054537. The next prime is 261534253054573. The reversal of 261534253054541 is 145450352435162.

It is a cyclic number.

It is not a de Polignac number, because 261534253054541 - 2² = 261534253054537 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261534253054541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261534253051541) 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, 348457931 + ... + 349207671.

It is an arithmetic number, because the mean of its divisors is an integer number (16985171090496).

Almost surely, 2^{261534253054541} is an apocalyptic number.

It is an amenable number.

261534253054541 is a deficient number, since it is larger than the sum of its proper divisors (10228484393395).

261534253054541 is a wasteful number, since it uses less digits than its factorization.

261534253054541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824444.

The product of its (nonzero) digits is 8640000, while the sum is 50.

The spelling of 261534253054541 in words is "two hundred sixty-one trillion, five hundred thirty-four billion, two hundred fifty-three million, fifty-four thousand, five hundred forty-one".