101665661506480 has 80 divisors (see below), whose sum is σ = 236607144387840. Its totient is φ = 40625943609344.

The previous prime is 101665661506463. The next prime is 101665661506531. The reversal of 101665661506480 is 84605166566101.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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, 331340976 + ... + 331647664.

It is an arithmetic number, because the mean of its divisors is an integer number (2957589304848).

Almost surely, 2^{101665661506480} is an apocalyptic number.

101665661506480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101665661506480 is an abundant number, since it is smaller than the sum of its proper divisors (134941482881360).

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

101665661506480 is a wasteful number, since it uses less digits than its factorization.

101665661506480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310798 (or 310792 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 101665661506480 in words is "one hundred one trillion, six hundred sixty-five billion, six hundred sixty-one million, five hundred six thousand, four hundred eighty".