1261127320026 has 32 divisors (see below), whose sum is σ = 2895503106048. Its totient is φ = 358706294640.

The previous prime is 1261127320003. The next prime is 1261127320027. The reversal of 1261127320026 is 6200237211621.

It is a super-2 number, since 2×1261127320026² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1261127320027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67315390 + ... + 67334121.

It is an arithmetic number, because the mean of its divisors is an integer number (90484472064).

Almost surely, 2^{1261127320026} is an apocalyptic number.

1261127320026 is an abundant number, since it is smaller than the sum of its proper divisors (1634375786022).

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

1261127320026 is a wasteful number, since it uses less digits than its factorization.

1261127320026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134649746.

The product of its (nonzero) digits is 12096, while the sum is 33.

The spelling of 1261127320026 in words is "one trillion, two hundred sixty-one billion, one hundred twenty-seven million, three hundred twenty thousand, twenty-six".