919218706540 has 384 divisors, whose sum is σ = 2219278860288. Its totient is φ = 318104616960.

The previous prime is 919218706477. The next prime is 919218706541. The reversal of 919218706540 is 45607812919.

It is not an unprimeable number, because it can be changed into a prime (919218706541) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4122056869 + ... + 4122057091.

It is an arithmetic number, because the mean of its divisors is an integer number (5779372032).

Almost surely, 2^919218706540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 919218706540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1109639430144).

919218706540 is an abundant number, since it is smaller than the sum of its proper divisors (1300060153748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

919218706540 is a wasteful number, since it uses less digits than its factorization.

919218706540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537 (or 535 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 919218706540 in words is "nine hundred nineteen billion, two hundred eighteen million, seven hundred six thousand, five hundred forty".