1975897641988 has 6 divisors (see below), whose sum is σ = 3457820873486. Its totient is φ = 987948820992.

The previous prime is 1975897641983. The next prime is 1975897642009. The reversal of 1975897641988 is 8891467985791.

It can be written as a sum of positive squares in only one way, i.e., 1840059694144 + 135837947844 = 1356488^2 + 368562^2 .

It is a super-2 number, since 2×1975897641988² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1975897641983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246987205245 + ... + 246987205252.

Almost surely, 2^{1975897641988} is an apocalyptic number.

It is an amenable number.

1975897641988 is a deficient number, since it is larger than the sum of its proper divisors (1481923231498).

1975897641988 is a wasteful number, since it uses less digits than its factorization.

1975897641988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493974410501 (or 493974410499 counting only the distinct ones).

The product of its digits is 2194698240, while the sum is 82.

The spelling of 1975897641988 in words is "one trillion, nine hundred seventy-five billion, eight hundred ninety-seven million, six hundred forty-one thousand, nine hundred eighty-eight".