2177730320640 has 144 divisors (see below), whose sum is σ = 7948715768448. Its totient is φ = 497766924288.

The previous prime is 2177730320617. The next prime is 2177730320657. The reversal of 2177730320640 is 460230377712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 2177730320592 and 2177730320601.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40481497 + ... + 40535256.

Almost surely, 2^{2177730320640} is an apocalyptic number.

2177730320640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2177730320640 is an abundant number, since it is smaller than the sum of its proper divisors (5770985447808).

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

2177730320640 is an equidigital number, since it uses as much as digits as its factorization.

2177730320640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81016784 (or 81016770 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 42.

The spelling of 2177730320640 in words is "two trillion, one hundred seventy-seven billion, seven hundred thirty million, three hundred twenty thousand, six hundred forty".