261622773 has 12 divisors (see below), whose sum is σ = 378974700. Its totient is φ = 173918976.

The previous prime is 261622747. The next prime is 261622783. The reversal of 261622773 is 377226162.

It is a happy number.

261622773 is a `hidden beast` number, since 26 + 1 + 622 + 7 + 7 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 145371249 + 116251524 = 12057^2 + 10782^2 .

It is not a de Polignac number, because 261622773 - 2¹⁰ = 261621749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261622783) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37998 + ... + 44351.

It is an arithmetic number, because the mean of its divisors is an integer number (31581225).

Almost surely, 2^261622773 is an apocalyptic number.

It is an amenable number.

261622773 is a deficient number, since it is larger than the sum of its proper divisors (117351927).

261622773 is a wasteful number, since it uses less digits than its factorization.

261622773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82708 (or 82705 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 261622773 is about 16174.7572779316. The cubic root of 261622773 is about 639.5755429378.

The spelling of 261622773 in words is "two hundred sixty-one million, six hundred twenty-two thousand, seven hundred seventy-three".