916666667640 has 320 divisors, whose sum is σ = 3219771202560. Its totient is φ = 233678027520.

The previous prime is 916666667629. The next prime is 916666667689. The reversal of 916666667640 is 46766666619.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6478045 + ... + 6618035.

It is an arithmetic number, because the mean of its divisors is an integer number (10061785008).

Almost surely, 2^916666667640 is an apocalyptic number.

916666667640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 916666667640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1609885601280).

916666667640 is an abundant number, since it is smaller than the sum of its proper divisors (2303104534920).

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

916666667640 is a wasteful number, since it uses less digits than its factorization.

916666667640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140104 (or 140091 counting only the distinct ones).

The product of its (nonzero) digits is 70543872, while the sum is 63.

The spelling of 916666667640 in words is "nine hundred sixteen billion, six hundred sixty-six million, six hundred sixty-seven thousand, six hundred forty".