1971652887906 has 128 divisors (see below), whose sum is σ = 4377363572736. Its totient is φ = 588204771840.

The previous prime is 1971652887851. The next prime is 1971652887929. The reversal of 1971652887906 is 6097882561791.

It is a super-2 number, since 2×1971652887906² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 508025086 + ... + 508028966.

It is an arithmetic number, because the mean of its divisors is an integer number (34198152912).

Almost surely, 2^{1971652887906} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1971652887906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2188681786368).

1971652887906 is an abundant number, since it is smaller than the sum of its proper divisors (2405710684830).

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

1971652887906 is a wasteful number, since it uses less digits than its factorization.

1971652887906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5016.

The product of its (nonzero) digits is 91445760, while the sum is 69.

The spelling of 1971652887906 in words is "one trillion, nine hundred seventy-one billion, six hundred fifty-two million, eight hundred eighty-seven thousand, nine hundred six".