1271201992668 has 72 divisors (see below), whose sum is σ = 3500978020400. Its totient is φ = 398808458496.

The previous prime is 1271201992663. The next prime is 1271201992699. The reversal of 1271201992668 is 8662991021721.

It is a happy number.

1271201992668 is a `hidden beast` number, since 1 + 271 + 20 + 1 + 99 + 266 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271201992661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20332783 + ... + 20395206.

Almost surely, 2^{1271201992668} is an apocalyptic number.

1271201992668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1271201992668 is an abundant number, since it is smaller than the sum of its proper divisors (2229776027732).

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

1271201992668 is a wasteful number, since it uses less digits than its factorization.

1271201992668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40728036 (or 40728011 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 1271201992668 in words is "one trillion, two hundred seventy-one billion, two hundred one million, nine hundred ninety-two thousand, six hundred sixty-eight".