261066355 has 16 divisors (see below), whose sum is σ = 343139328. Its totient is φ = 189100000.

The previous prime is 261066343. The next prime is 261066389. The reversal of 261066355 is 553660162.

It is not a de Polignac number, because 261066355 - 2⁹ = 261065843 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 261066355.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4350 + ... + 23260.

It is an arithmetic number, because the mean of its divisors is an integer number (21446208).

Almost surely, 2^261066355 is an apocalyptic number.

261066355 is a deficient number, since it is larger than the sum of its proper divisors (82072973).

261066355 is a wasteful number, since it uses less digits than its factorization.

261066355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19178.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 261066355 is about 16157.5479265884. The cubic root of 261066355 is about 639.1218057658.

The spelling of 261066355 in words is "two hundred sixty-one million, sixty-six thousand, three hundred fifty-five".