1261609202957 has 8 divisors (see below), whose sum is σ = 1276899919680. Its totient is φ = 1246320643680.

The previous prime is 1261609202947. The next prime is 1261609202983. The reversal of 1261609202957 is 7592029061621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1261609202957 - 2¹⁰ = 1261609201933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261609202947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 653144 + ... + 1717502.

It is an arithmetic number, because the mean of its divisors is an integer number (159612489960).

Almost surely, 2^{1261609202957} is an apocalyptic number.

It is an amenable number.

1261609202957 is a deficient number, since it is larger than the sum of its proper divisors (15290716723).

1261609202957 is a wasteful number, since it uses less digits than its factorization.

1261609202957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078723.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 1261609202957 in words is "one trillion, two hundred sixty-one billion, six hundred nine million, two hundred two thousand, nine hundred fifty-seven".