919493420845 has 16 divisors (see below), whose sum is σ = 1168324346160. Its totient is φ = 692308562944.

The previous prime is 919493420843. The next prime is 919493420863. The reversal of 919493420845 is 548024394919.

It can be written as a sum of positive squares in 8 ways, for example, as 148238860324 + 771254560521 = 385018^2 + 878211^2 .

It is a cyclic number.

It is not a de Polignac number, because 919493420845 - 2¹ = 919493420843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 919493420845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (919493420843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4692291 + ... + 4884319.

It is an arithmetic number, because the mean of its divisors is an integer number (73020271635).

Almost surely, 2^919493420845 is an apocalyptic number.

It is an amenable number.

919493420845 is a deficient number, since it is larger than the sum of its proper divisors (248830925315).

919493420845 is a wasteful number, since it uses less digits than its factorization.

919493420845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248384.

The product of its (nonzero) digits is 11197440, while the sum is 58.

The spelling of 919493420845 in words is "nine hundred nineteen billion, four hundred ninety-three million, four hundred twenty thousand, eight hundred forty-five".