619879540657 has 8 divisors (see below), whose sum is σ = 667572681384. Its totient is φ = 572187842688.

The previous prime is 619879540649. The next prime is 619879540703. The reversal of 619879540657 is 756045978916.

It can be written as a sum of positive squares in 4 ways, for example, as 128960710321 + 490918830336 = 359111^2 + 700656^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 619879540657 - 2³ = 619879540649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 619879540592 and 619879540601.

It is not an unprimeable number, because it can be changed into a prime (619879540057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 633093 + ... + 1280845.

It is an arithmetic number, because the mean of its divisors is an integer number (83446585173).

Almost surely, 2^619879540657 is an apocalyptic number.

It is an amenable number.

619879540657 is a deficient number, since it is larger than the sum of its proper divisors (47693140727).

619879540657 is a wasteful number, since it uses less digits than its factorization.

619879540657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721379.

The product of its (nonzero) digits is 114307200, while the sum is 67.

The spelling of 619879540657 in words is "six hundred nineteen billion, eight hundred seventy-nine million, five hundred forty thousand, six hundred fifty-seven".