1261457663135 has 16 divisors (see below), whose sum is σ = 1566902793216. Its totient is φ = 974159923968.

The previous prime is 1261457663101. The next prime is 1261457663143. The reversal of 1261457663135 is 5313667541621.

It is a cyclic number.

It is not a de Polignac number, because 1261457663135 - 2⁶ = 1261457663071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26821742 + ... + 26868731.

It is an arithmetic number, because the mean of its divisors is an integer number (97931424576).

Almost surely, 2^{1261457663135} is an apocalyptic number.

1261457663135 is a deficient number, since it is larger than the sum of its proper divisors (305445130081).

1261457663135 is a wasteful number, since it uses less digits than its factorization.

1261457663135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53690642.

The product of its digits is 2721600, while the sum is 50.

The spelling of 1261457663135 in words is "one trillion, two hundred sixty-one billion, four hundred fifty-seven million, six hundred sixty-three thousand, one hundred thirty-five".