261066051 has 8 divisors (see below), whose sum is σ = 386764560. Its totient is φ = 174044016.

The previous prime is 261066041. The next prime is 261066053. The reversal of 261066051 is 150660162.

It is a happy number.

It is not a de Polignac number, because 261066051 - 2¹⁰ = 261065027 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 9669113 = 261066051 / (2 + 6 + 1 + 0 + 6 + 6 + 0 + 5 + 1).

It is not an unprimeable number, because it can be changed into a prime (261066053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4834530 + ... + 4834583.

It is an arithmetic number, because the mean of its divisors is an integer number (48345570).

Almost surely, 2^261066051 is an apocalyptic number.

261066051 is a deficient number, since it is larger than the sum of its proper divisors (125698509).

261066051 is an equidigital number, since it uses as much as digits as its factorization.

261066051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9669122 (or 9669116 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 261066051 is about 16157.5385192176. The cubic root of 261066051 is about 639.1215576896.

The spelling of 261066051 in words is "two hundred sixty-one million, sixty-six thousand, fifty-one".