619645609678 has 4 divisors (see below), whose sum is σ = 929468414520. Its totient is φ = 309822804838.

The previous prime is 619645609657. The next prime is 619645609729. The reversal of 619645609678 is 876906546916.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154911402418 + ... + 154911402421.

It is an arithmetic number, because the mean of its divisors is an integer number (232367103630).

Almost surely, 2^619645609678 is an apocalyptic number.

619645609678 is a deficient number, since it is larger than the sum of its proper divisors (309822804842).

619645609678 is a wasteful number, since it uses less digits than its factorization.

619645609678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309822804841.

The product of its (nonzero) digits is 117573120, while the sum is 67.

The spelling of 619645609678 in words is "six hundred nineteen billion, six hundred forty-five million, six hundred nine thousand, six hundred seventy-eight".