1261055503776 has 96 divisors (see below), whose sum is σ = 3604650638400. Its totient is φ = 384496035840.

The previous prime is 1261055503739. The next prime is 1261055503787. The reversal of 1261055503776 is 6773055501621.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 11867245 + ... + 11973036.

It is an arithmetic number, because the mean of its divisors is an integer number (37548444150).

Almost surely, 2^{1261055503776} is an apocalyptic number.

1261055503776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1261055503776 is an abundant number, since it is smaller than the sum of its proper divisors (2343595134624).

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

1261055503776 is a wasteful number, since it uses less digits than its factorization.

1261055503776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23840342 (or 23840334 counting only the distinct ones).

The product of its (nonzero) digits is 1323000, while the sum is 48.

The spelling of 1261055503776 in words is "one trillion, two hundred sixty-one billion, fifty-five million, five hundred three thousand, seven hundred seventy-six".