1205401251545 has 4 divisors (see below), whose sum is σ = 1446481501860. Its totient is φ = 964321001232.

The previous prime is 1205401251493. The next prime is 1205401251583. The reversal of 1205401251545 is 5451521045021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 232645122889 + 972756128656 = 482333^2 + 986284^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205401251545 - 2¹⁶ = 1205401186009 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120540125150 + ... + 120540125159.

It is an arithmetic number, because the mean of its divisors is an integer number (361620375465).

Almost surely, 2^{1205401251545} is an apocalyptic number.

It is an amenable number.

1205401251545 is a deficient number, since it is larger than the sum of its proper divisors (241080250315).

1205401251545 is an equidigital number, since it uses as much as digits as its factorization.

1205401251545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241080250314.

The product of its (nonzero) digits is 40000, while the sum is 35.

Adding to 1205401251545 its reverse (5451521045021), we get a palindrome (6656922296566).

The spelling of 1205401251545 in words is "one trillion, two hundred five billion, four hundred one million, two hundred fifty-one thousand, five hundred forty-five".