1661255623255 has 8 divisors (see below), whose sum is σ = 2110771850832. Its totient is φ = 1250827763328.

The previous prime is 1661255623249. The next prime is 1661255623259. The reversal of 1661255623255 is 5523265521661.

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 1661255623255 - 2⁷ = 1661255623127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1661255623199 and 1661255623208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661255623259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9772091817 + ... + 9772091986.

It is an arithmetic number, because the mean of its divisors is an integer number (263846481354).

Almost surely, 2^{1661255623255} is an apocalyptic number.

1661255623255 is a deficient number, since it is larger than the sum of its proper divisors (449516227577).

1661255623255 is a wasteful number, since it uses less digits than its factorization.

1661255623255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19544183825.

The product of its digits is 3240000, while the sum is 49.

The spelling of 1661255623255 in words is "one trillion, six hundred sixty-one billion, two hundred fifty-five million, six hundred twenty-three thousand, two hundred fifty-five".