1974521971881 has 8 divisors (see below), whose sum is σ = 2925217736160. Its totient is φ = 1316347981236.

The previous prime is 1974521971871. The next prime is 1974521971883. The reversal of 1974521971881 is 1881791254791.

1974521971881 is a `hidden beast` number, since 1 + 9 + 7 + 4 + 521 + 97 + 18 + 8 + 1 = 666.

It is not a de Polignac number, because 1974521971881 - 2⁷ = 1974521971753 is a prime.

It is a super-2 number, since 2×1974521971881² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1974521971883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36565221675 + ... + 36565221728.

It is an arithmetic number, because the mean of its divisors is an integer number (365652217020).

Almost surely, 2^{1974521971881} is an apocalyptic number.

It is an amenable number.

1974521971881 is a deficient number, since it is larger than the sum of its proper divisors (950695764279).

1974521971881 is an equidigital number, since it uses as much as digits as its factorization.

1974521971881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73130443412 (or 73130443406 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 63.

The spelling of 1974521971881 in words is "one trillion, nine hundred seventy-four billion, five hundred twenty-one million, nine hundred seventy-one thousand, eight hundred eighty-one".