261464232638 has 32 divisors (see below), whose sum is σ = 488084659200. Its totient is φ = 102497772384.

The previous prime is 261464232637. The next prime is 261464232683. The reversal of 261464232638 is 836232464162.

It is a junction number, because it is equal to n+sod(n) for n = 261464232592 and 261464232601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261464232637) 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, 16939670 + ... + 16955097.

It is an arithmetic number, because the mean of its divisors is an integer number (15252645600).

Almost surely, 2^261464232638 is an apocalyptic number.

261464232638 is a deficient number, since it is larger than the sum of its proper divisors (226620426562).

261464232638 is a wasteful number, since it uses less digits than its factorization.

261464232638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33894824.

The product of its digits is 1990656, while the sum is 47.

The spelling of 261464232638 in words is "two hundred sixty-one billion, four hundred sixty-four million, two hundred thirty-two thousand, six hundred thirty-eight".