80921465772840 has 3840 divisors, whose sum is σ = 378249224601600. Its totient is φ = 15284505600000.

The previous prime is 80921465772817. The next prime is 80921465772841. The reversal of 80921465772840 is 4827756412908.

It is a happy number.

80921465772840 is a `hidden beast` number, since 8 + 0 + 9 + 2 + 14 + 6 + 577 + 2 + 8 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (80921465772841) by changing a digit.

It is a polite number, since it can be written in 959 ways as a sum of consecutive naturals, for example, 155319511780 + ... + 155319512300.

It is an arithmetic number, because the mean of its divisors is an integer number (98502402240).

Almost surely, 2^{80921465772840} 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 80921465772840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189124612300800).

80921465772840 is an abundant number, since it is smaller than the sum of its proper divisors (297327758828760).

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

80921465772840 is a wasteful number, since it uses less digits than its factorization.

80921465772840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 54190080, while the sum is 63.

The spelling of 80921465772840 in words is "eighty trillion, nine hundred twenty-one billion, four hundred sixty-five million, seven hundred seventy-two thousand, eight hundred forty".