1971056709738 has 96 divisors (see below), whose sum is σ = 4321328466000. Its totient is φ = 649278332928.

The previous prime is 1971056709733. The next prime is 1971056709749. The reversal of 1971056709738 is 8379076501791.

It can be written as a sum of positive squares in 8 ways, for example, as 242007915249 + 1729048794489 = 491943^2 + 1314933^2 .

It is not an unprimeable number, because it can be changed into a prime (1971056709733) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 335839068 + ... + 335844936.

Almost surely, 2^{1971056709738} is an apocalyptic number.

1971056709738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1971056709738 is an abundant number, since it is smaller than the sum of its proper divisors (2350271756262).

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

1971056709738 is a wasteful number, since it uses less digits than its factorization.

1971056709738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6696 (or 6693 counting only the distinct ones).

The product of its (nonzero) digits is 20003760, while the sum is 63.

The spelling of 1971056709738 in words is "one trillion, nine hundred seventy-one billion, fifty-six million, seven hundred nine thousand, seven hundred thirty-eight".