1261457663136 has 48 divisors (see below), whose sum is σ = 3612356038368. Its totient is φ = 382259897600.

The previous prime is 1261457663101. The next prime is 1261457663143. The reversal of 1261457663136 is 6313667541621.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 597280035 + ... + 597282146.

It is an arithmetic number, because the mean of its divisors is an integer number (75257417466).

Almost surely, 2^{1261457663136} is an apocalyptic number.

1261457663136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1261457663136 is an abundant number, since it is smaller than the sum of its proper divisors (2350898375232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261457663136 is a wasteful number, since it uses less digits than its factorization.

1261457663136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194562205 (or 1194562197 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 51.

The spelling of 1261457663136 in words is "one trillion, two hundred sixty-one billion, four hundred fifty-seven million, six hundred sixty-three thousand, one hundred thirty-six".