1958649640879 has 2 divisors, whose sum is σ = 1958649640880. Its totient is φ = 1958649640878.

The previous prime is 1958649640877. The next prime is 1958649640889. The reversal of 1958649640879 is 9780469468591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1958649640879 - 2¹ = 1958649640877 is a prime.

Together with 1958649640877, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1958649640877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 979324820439 + 979324820440.

It is an arithmetic number, because the mean of its divisors is an integer number (979324820440).

Almost surely, 2^{1958649640879} is an apocalyptic number.

1958649640879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1958649640879 is an equidigital number, since it uses as much as digits as its factorization.

1958649640879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 940584960, while the sum is 76.

The spelling of 1958649640879 in words is "one trillion, nine hundred fifty-eight billion, six hundred forty-nine million, six hundred forty thousand, eight hundred seventy-nine".