1971481289648 has 80 divisors (see below), whose sum is σ = 4124388209760. Its totient is φ = 907523801088.

The previous prime is 1971481289621. The next prime is 1971481289651. The reversal of 1971481289648 is 8469821841791.

It is a happy number.

Its product of digits (55738368) is a multiple of the sum of its prime divisors (10368).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282565136 + ... + 282572112.

It is an arithmetic number, because the mean of its divisors is an integer number (51554852622).

Almost surely, 2^{1971481289648} is an apocalyptic number.

It is an amenable number.

1971481289648 is an abundant number, since it is smaller than the sum of its proper divisors (2152906920112).

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

1971481289648 is a wasteful number, since it uses less digits than its factorization.

1971481289648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10374 (or 10368 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 68.

The spelling of 1971481289648 in words is "one trillion, nine hundred seventy-one billion, four hundred eighty-one million, two hundred eighty-nine thousand, six hundred forty-eight".