261440571622254 has 16 divisors (see below), whose sum is σ = 523131445396560. Its totient is φ = 87105140182080.

The previous prime is 261440571622231. The next prime is 261440571622259. The reversal of 261440571622254 is 452226175044162.

It is a junction number, because it is equal to n+sod(n) for n = 261440571622197 and 261440571622206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261440571622259) 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, 10429242757 + ... + 10429267824.

It is an arithmetic number, because the mean of its divisors is an integer number (32695715337285).

Almost surely, 2^{261440571622254} is an apocalyptic number.

261440571622254 is an abundant number, since it is smaller than the sum of its proper divisors (261690873774306).

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

261440571622254 is a wasteful number, since it uses less digits than its factorization.

261440571622254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20858512675.

The product of its (nonzero) digits is 6451200, while the sum is 51.

The spelling of 261440571622254 in words is "two hundred sixty-one trillion, four hundred forty billion, five hundred seventy-one million, six hundred twenty-two thousand, two hundred fifty-four".