1261201430660 has 24 divisors (see below), whose sum is σ = 2648850282456. Its totient is φ = 504418233600.

The previous prime is 1261201430659. The next prime is 1261201430719. The reversal of 1261201430660 is 660341021621.

It can be written as a sum of positive squares in 4 ways, for example, as 824925328516 + 436276102144 = 908254^2 + 660512^2 .

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, 3730097 + ... + 4054136.

It is an arithmetic number, because the mean of its divisors is an integer number (110368761769).

Almost surely, 2^{1261201430660} is an apocalyptic number.

1261201430660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261201430660 is an abundant number, since it is smaller than the sum of its proper divisors (1387648851796).

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

1261201430660 is a wasteful number, since it uses less digits than its factorization.

1261201430660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7792343 (or 7792341 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 1261201430660 in words is "one trillion, two hundred sixty-one billion, two hundred one million, four hundred thirty thousand, six hundred sixty".