1281601641511 has 8 divisors (see below), whose sum is σ = 1327887665424. Its totient is φ = 1235928677760.

The previous prime is 1281601641497. The next prime is 1281601641517. The reversal of 1281601641511 is 1151461061821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1281601641511 - 2¹¹ = 1281601639463 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281601641517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153260785 + ... + 153269146.

It is an arithmetic number, because the mean of its divisors is an integer number (165985958178).

Almost surely, 2^{1281601641511} is an apocalyptic number.

1281601641511 is a deficient number, since it is larger than the sum of its proper divisors (46286023913).

1281601641511 is a wasteful number, since it uses less digits than its factorization.

1281601641511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306530081.

The product of its (nonzero) digits is 11520, while the sum is 37.

It can be divided in two parts, 128160 and 1641511, that added together give a palindrome (1769671).

The spelling of 1281601641511 in words is "one trillion, two hundred eighty-one billion, six hundred one million, six hundred forty-one thousand, five hundred eleven".