261516426 has 8 divisors (see below), whose sum is σ = 523032864. Its totient is φ = 87172140.

The previous prime is 261516401. The next prime is 261516427. The reversal of 261516426 is 624615162.

It is a sphenic number, since it is the product of 3 distinct primes.

261516426 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (261516427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21793030 + ... + 21793041.

It is an arithmetic number, because the mean of its divisors is an integer number (65379108).

Almost surely, 2^261516426 is an apocalyptic number.

261516426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

261516426 is a wasteful number, since it uses less digits than its factorization.

261516426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43586076.

The product of its digits is 17280, while the sum is 33.

The square root of 261516426 is about 16171.4695065105. The cubic root of 261516426 is about 639.4888708722.

The spelling of 261516426 in words is "two hundred sixty-one million, five hundred sixteen thousand, four hundred twenty-six".