1261209595296 has 192 divisors, whose sum is σ = 4048060907520. Its totient is φ = 335783439360.

The previous prime is 1261209595267. The next prime is 1261209595313. The reversal of 1261209595296 is 6925959021621.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30816 + ... + 1588511.

It is an arithmetic number, because the mean of its divisors is an integer number (21083650560).

Almost surely, 2^{1261209595296} is an apocalyptic number.

1261209595296 is a gapful number since it is divisible by the number (16) 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 1261209595296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2024030453760).

1261209595296 is an abundant number, since it is smaller than the sum of its proper divisors (2786851312224).

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

1261209595296 is a wasteful number, since it uses less digits than its factorization.

1261209595296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619427 (or 1619419 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 57.

The spelling of 1261209595296 in words is "one trillion, two hundred sixty-one billion, two hundred nine million, five hundred ninety-five thousand, two hundred ninety-six".