1265454656655 has 64 divisors (see below), whose sum is σ = 2454383213568. Its totient is φ = 543510558720.

The previous prime is 1265454656639. The next prime is 1265454656671. The reversal of 1265454656655 is 5566564545621.

It is an interprime number because it is at equal distance from previous prime (1265454656639) and next prime (1265454656671).

It is not a de Polignac number, because 1265454656655 - 2⁴ = 1265454656639 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 398449 + ... + 1640021.

It is an arithmetic number, because the mean of its divisors is an integer number (38349737712).

Almost surely, 2^{1265454656655} is an apocalyptic number.

1265454656655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1265454656655 is a deficient number, since it is larger than the sum of its proper divisors (1188928556913).

1265454656655 is a wasteful number, since it uses less digits than its factorization.

1265454656655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242176.

The product of its digits is 129600000, while the sum is 60.

The spelling of 1265454656655 in words is "one trillion, two hundred sixty-five billion, four hundred fifty-four million, six hundred fifty-six thousand, six hundred fifty-five".