1291662233478 has 24 divisors (see below), whose sum is σ = 2874239385888. Its totient is φ = 418917480912.

The previous prime is 1291662233437. The next prime is 1291662233501. The reversal of 1291662233478 is 8743322661921.

1291662233478 is a `hidden beast` number, since 1 + 2 + 9 + 1 + 6 + 622 + 3 + 3 + 4 + 7 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 969715726 + ... + 969717057.

It is an arithmetic number, because the mean of its divisors is an integer number (119759974412).

Almost surely, 2^{1291662233478} is an apocalyptic number.

1291662233478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1291662233478 is an abundant number, since it is smaller than the sum of its proper divisors (1582577152410).

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

1291662233478 is a wasteful number, since it uses less digits than its factorization.

1291662233478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939432828 (or 1939432825 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The spelling of 1291662233478 in words is "one trillion, two hundred ninety-one billion, six hundred sixty-two million, two hundred thirty-three thousand, four hundred seventy-eight".