261421722350475 has 24 divisors (see below), whose sum is σ = 451009301866752. Its totient is φ = 133362965604000.

The previous prime is 261421722350461. The next prime is 261421722350479. The reversal of 261421722350475 is 574053227124162.

It is not a de Polignac number, because 261421722350475 - 2⁴¹ = 259222699094923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261421722350479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75774410551 + ... + 75774414000.

It is an arithmetic number, because the mean of its divisors is an integer number (18792054244448).

Almost surely, 2^{261421722350475} is an apocalyptic number.

261421722350475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261421722350475 is a deficient number, since it is larger than the sum of its proper divisors (189587579516277).

261421722350475 is a wasteful number, since it uses less digits than its factorization.

261421722350475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151548824587 (or 151548824582 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 51.

The spelling of 261421722350475 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, seven hundred twenty-two million, three hundred fifty thousand, four hundred seventy-five".