261543674101412 has 6 divisors (see below), whose sum is σ = 457701429677478. Its totient is φ = 130771837050704.

The previous prime is 261543674101387. The next prime is 261543674101417. The reversal of 261543674101412 is 214101476345162.

It can be written as a sum of positive squares in only one way, i.e., 259526751507556 + 2016922593856 = 16109834^2 + 1420184^2 .

It is a super-2 number, since 2×261543674101412² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261543674101417) 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 as a sum of consecutive naturals, namely, 32692959262673 + ... + 32692959262680.

It is an arithmetic number, because the mean of its divisors is an integer number (76283571612913).

Almost surely, 2^{261543674101412} is an apocalyptic number.

It is an amenable number.

261543674101412 is a deficient number, since it is larger than the sum of its proper divisors (196157755576066).

261543674101412 is a wasteful number, since it uses less digits than its factorization.

261543674101412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65385918525357 (or 65385918525355 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 261543674101412 in words is "two hundred sixty-one trillion, five hundred forty-three billion, six hundred seventy-four million, one hundred one thousand, four hundred twelve".