1291862933656 has 8 divisors (see below), whose sum is σ = 2422243000620. Its totient is φ = 645931466824.

The previous prime is 1291862933617. The next prime is 1291862933657. The reversal of 1291862933656 is 6563392681921.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 1291862933594 and 1291862933603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291862933657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80741433346 + ... + 80741433361.

Almost surely, 2^{1291862933656} is an apocalyptic number.

It is an amenable number.

1291862933656 is a deficient number, since it is larger than the sum of its proper divisors (1130380066964).

1291862933656 is a wasteful number, since it uses less digits than its factorization.

1291862933656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161482866713 (or 161482866709 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 61.

The spelling of 1291862933656 in words is "one trillion, two hundred ninety-one billion, eight hundred sixty-two million, nine hundred thirty-three thousand, six hundred fifty-six".