1261931880132 has 648 divisors, whose sum is σ = 4265797431168. Its totient is φ = 307258997760.

The previous prime is 1261931880107. The next prime is 1261931880133. The reversal of 1261931880132 is 2310881391621.

1261931880132 is a `hidden beast` number, since 1 + 2 + 619 + 3 + 18 + 8 + 0 + 13 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261931880133) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 8037782598 + ... + 8037782754.

Almost surely, 2^{1261931880132} is an apocalyptic number.

1261931880132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1261931880132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2132898715584).

1261931880132 is an abundant number, since it is smaller than the sum of its proper divisors (3003865551036).

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

1261931880132 is a wasteful number, since it uses less digits than its factorization.

1261931880132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 1261931880132 in words is "one trillion, two hundred sixty-one billion, nine hundred thirty-one million, eight hundred eighty thousand, one hundred thirty-two".