261072066 has 32 divisors (see below), whose sum is σ = 535965120. Its totient is φ = 84750336.

The previous prime is 261072061. The next prime is 261072079. The reversal of 261072066 is 660270162.

261072066 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261072061) 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, 32130 + ... + 39426.

It is an arithmetic number, because the mean of its divisors is an integer number (16748910).

Almost surely, 2^261072066 is an apocalyptic number.

261072066 is an abundant number, since it is smaller than the sum of its proper divisors (274893054).

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

261072066 is a wasteful number, since it uses less digits than its factorization.

261072066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7458.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 261072066 is about 16157.7246541708. The cubic root of 261072066 is about 639.1264661366.

The spelling of 261072066 in words is "two hundred sixty-one million, seventy-two thousand, sixty-six".