261366552 has 48 divisors (see below), whose sum is σ = 709566000. Its totient is φ = 86913216.

The previous prime is 261366533. The next prime is 261366559. The reversal of 261366552 is 255663162.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261366559) 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, 27474 + ... + 35742.

It is an arithmetic number, because the mean of its divisors is an integer number (14782625).

Almost surely, 2^261366552 is an apocalyptic number.

It is an amenable number.

261366552 is an abundant number, since it is smaller than the sum of its proper divisors (448199448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261366552 is a wasteful number, since it uses less digits than its factorization.

261366552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8720 (or 8713 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 261366552 is about 16166.8349407050. The cubic root of 261366552 is about 639.3666847042.

The spelling of 261366552 in words is "two hundred sixty-one million, three hundred sixty-six thousand, five hundred fifty-two".