19775407778 has 32 divisors (see below), whose sum is σ = 34091559936. Its totient is φ = 8427588048.

The previous prime is 19775407747. The next prime is 19775407789. The reversal of 19775407778 is 87770457791.

It is a self number, because there is not a number n which added to its sum of digits gives 19775407778.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1987925 + ... + 1997847.

It is an arithmetic number, because the mean of its divisors is an integer number (1065361248).

Almost surely, 2^19775407778 is an apocalyptic number.

19775407778 is a deficient number, since it is larger than the sum of its proper divisors (14316152158).

19775407778 is a wasteful number, since it uses less digits than its factorization.

19775407778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10718.

The product of its (nonzero) digits is 24202080, while the sum is 62.

The spelling of 19775407778 in words is "nineteen billion, seven hundred seventy-five million, four hundred seven thousand, seven hundred seventy-eight".