1971998380007 has 2 divisors, whose sum is σ = 1971998380008. Its totient is φ = 1971998380006.

The previous prime is 1971998379979. The next prime is 1971998380021. The reversal of 1971998380007 is 7000838991791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1971998380007 - 2¹⁸ = 1971998117863 is a prime.

It is a super-2 number, since 2×1971998380007² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1971998380097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985999190003 + 985999190004.

It is an arithmetic number, because the mean of its divisors is an integer number (985999190004).

Almost surely, 2^{1971998380007} is an apocalyptic number.

1971998380007 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971998380007 is an equidigital number, since it uses as much as digits as its factorization.

1971998380007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6858432, while the sum is 62.

The spelling of 1971998380007 in words is "one trillion, nine hundred seventy-one billion, nine hundred ninety-eight million, three hundred eighty thousand, seven".