261623500606 has 32 divisors (see below), whose sum is σ = 431184777408. Its totient is φ = 118318026240.

The previous prime is 261623500603. The next prime is 261623500673. The reversal of 261623500606 is 606005326162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261623500603) 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, 103510 + ... + 730726.

It is an arithmetic number, because the mean of its divisors is an integer number (13474524294).

Almost surely, 2^261623500606 is an apocalyptic number.

261623500606 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

261623500606 is a deficient number, since it is larger than the sum of its proper divisors (169561276802).

261623500606 is a wasteful number, since it uses less digits than its factorization.

261623500606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627556.

The product of its (nonzero) digits is 77760, while the sum is 37.

Adding to 261623500606 its reverse (606005326162), we get a palindrome (867628826768).

The spelling of 261623500606 in words is "two hundred sixty-one billion, six hundred twenty-three million, five hundred thousand, six hundred six".