1306121651655 has 128 divisors (see below), whose sum is σ = 2218657996800. Its totient is φ = 655235481600.

The previous prime is 1306121651651. The next prime is 1306121651657. The reversal of 1306121651655 is 5561561216031.

It is not a de Polignac number, because 1306121651655 - 2² = 1306121651651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1306121651651) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1013282251 + ... + 1013283539.

It is an arithmetic number, because the mean of its divisors is an integer number (17333265600).

Almost surely, 2^{1306121651655} is an apocalyptic number.

1306121651655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1306121651655 is a deficient number, since it is larger than the sum of its proper divisors (912536345145).

1306121651655 is a wasteful number, since it uses less digits than its factorization.

1306121651655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785.

The product of its (nonzero) digits is 162000, while the sum is 42.

Adding to 1306121651655 its reverse (5561561216031), we get a palindrome (6867682867686).

The spelling of 1306121651655 in words is "one trillion, three hundred six billion, one hundred twenty-one million, six hundred fifty-one thousand, six hundred fifty-five".