1261307559355 has 32 divisors (see below), whose sum is σ = 1625427046656. Its totient is φ = 936241004544.

The previous prime is 1261307559301. The next prime is 1261307559433. The reversal of 1261307559355 is 5539557031621.

It is a cyclic number.

It is not a de Polignac number, because 1261307559355 - 2²⁵ = 1261274004923 is a prime.

It is a Duffinian number.

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, 1821342 + ... + 2416588.

It is an arithmetic number, because the mean of its divisors is an integer number (50794595208).

Almost surely, 2^{1261307559355} is an apocalyptic number.

1261307559355 is a deficient number, since it is larger than the sum of its proper divisors (364119487301).

1261307559355 is a wasteful number, since it uses less digits than its factorization.

1261307559355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595623.

The product of its (nonzero) digits is 4252500, while the sum is 52.

The spelling of 1261307559355 in words is "one trillion, two hundred sixty-one billion, three hundred seven million, five hundred fifty-nine thousand, three hundred fifty-five".