1971126572016 has 80 divisors (see below), whose sum is σ = 5822389557504. Its totient is φ = 562900987392.

The previous prime is 1971126572003. The next prime is 1971126572039. The reversal of 1971126572016 is 6102756211791.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 766005 + ... + 2128148.

Almost surely, 2^{1971126572016} is an apocalyptic number.

1971126572016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1971126572016 is an abundant number, since it is smaller than the sum of its proper divisors (3851262985488).

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

1971126572016 is a wasteful number, since it uses less digits than its factorization.

1971126572016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896198 (or 2896192 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 48.

The spelling of 1971126572016 in words is "one trillion, nine hundred seventy-one billion, one hundred twenty-six million, five hundred seventy-two thousand, sixteen".