619372106721 has 12 divisors (see below), whose sum is σ = 899591410900. Its totient is φ = 410633439840.

The previous prime is 619372106699. The next prime is 619372106741. The reversal of 619372106721 is 127601273916.

619372106721 is a `hidden beast` number, since 619 + 3 + 7 + 2 + 1 + 0 + 6 + 7 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 265751591121 + 353620515600 = 515511^2 + 594660^2 .

It is not a de Polignac number, because 619372106721 - 2²⁷ = 619237888993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (619372106741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190106446 + ... + 190109703.

Almost surely, 2^619372106721 is an apocalyptic number.

It is an amenable number.

619372106721 is a deficient number, since it is larger than the sum of its proper divisors (280219304179).

619372106721 is a wasteful number, since it uses less digits than its factorization.

619372106721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380216336 (or 380216333 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The spelling of 619372106721 in words is "six hundred nineteen billion, three hundred seventy-two million, one hundred six thousand, seven hundred twenty-one".