261645662 has 16 divisors (see below), whose sum is σ = 395176320. Its totient is φ = 129923928.

The previous prime is 261645617. The next prime is 261645667. The reversal of 261645662 is 266546162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261645667) 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, 219833 + ... + 221019.

It is an arithmetic number, because the mean of its divisors is an integer number (24698520).

Almost surely, 2^261645662 is an apocalyptic number.

261645662 is a deficient number, since it is larger than the sum of its proper divisors (133530658).

261645662 is a wasteful number, since it uses less digits than its factorization.

261645662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855.

The product of its digits is 103680, while the sum is 38.

The square root of 261645662 is about 16175.4648155779. The cubic root of 261645662 is about 639.5941942419.

The spelling of 261645662 in words is "two hundred sixty-one million, six hundred forty-five thousand, six hundred sixty-two".