261534370436403 has 8 divisors (see below), whose sum is σ = 355291974932688. Its totient is φ = 171066506448864.

The previous prime is 261534370436363. The next prime is 261534370436441. The reversal of 261534370436403 is 304634073435162.

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

It is not a de Polignac number, because 261534370436403 - 2⁸ = 261534370436147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (269534370436403) 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, 822435127000 + ... + 822435127317.

It is an arithmetic number, because the mean of its divisors is an integer number (44411496866586).

Almost surely, 2^{261534370436403} is an apocalyptic number.

261534370436403 is a deficient number, since it is larger than the sum of its proper divisors (93757604496285).

261534370436403 is a wasteful number, since it uses less digits than its factorization.

261534370436403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644870254373.

The product of its (nonzero) digits is 13063680, while the sum is 51.

The spelling of 261534370436403 in words is "two hundred sixty-one trillion, five hundred thirty-four billion, three hundred seventy million, four hundred thirty-six thousand, four hundred three".