261552445267473 has 64 divisors (see below), whose sum is σ = 412575578553600. Its totient is φ = 163523506475520.

The previous prime is 261552445267457. The next prime is 261552445267513. The reversal of 261552445267473 is 374762544255162.

261552445267473 is a `hidden beast` number, since 2 + 6 + 1 + 5 + 52 + 4 + 4 + 52 + 67 + 473 = 666.

It is not a de Polignac number, because 261552445267473 - 2⁴ = 261552445267457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261552445267473.

It is not an unprimeable number, because it can be changed into a prime (261552445267423) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35068558 + ... + 41867751.

It is an arithmetic number, because the mean of its divisors is an integer number (6446493414900).

Almost surely, 2^{261552445267473} is an apocalyptic number.

It is an amenable number.

261552445267473 is a deficient number, since it is larger than the sum of its proper divisors (151023133286127).

261552445267473 is a wasteful number, since it uses less digits than its factorization.

261552445267473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76936479 (or 76936473 counting only the distinct ones).

The product of its digits is 338688000, while the sum is 63.

The spelling of 261552445267473 in words is "two hundred sixty-one trillion, five hundred fifty-two billion, four hundred forty-five million, two hundred sixty-seven thousand, four hundred seventy-three".