1954193187779 has 32 divisors (see below), whose sum is σ = 2362830159360. Its totient is φ = 1578821932800.

The previous prime is 1954193187763. The next prime is 1954193187829. The reversal of 1954193187779 is 9777813914591.

It is not a de Polignac number, because 1954193187779 - 2⁴ = 1954193187763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1954193187719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100820669 + ... + 100840049.

It is an arithmetic number, because the mean of its divisors is an integer number (73838442480).

Almost surely, 2^{1954193187779} is an apocalyptic number.

1954193187779 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1954193187779 is a deficient number, since it is larger than the sum of its proper divisors (408636971581).

1954193187779 is a wasteful number, since it uses less digits than its factorization.

1954193187779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23211.

The product of its digits is 120022560, while the sum is 71.

The spelling of 1954193187779 in words is "one trillion, nine hundred fifty-four billion, one hundred ninety-three million, one hundred eighty-seven thousand, seven hundred seventy-nine".