66506255222540 has 48 divisors (see below), whose sum is σ = 159635736271872. Its totient is φ = 22799184113856.

The previous prime is 66506255222507. The next prime is 66506255222573. The reversal of 66506255222540 is 4522255260566.

It is an interprime number because it is at equal distance from previous prime (66506255222507) and next prime (66506255222573).

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, 29756624 + ... + 31913463.

It is an arithmetic number, because the mean of its divisors is an integer number (3325744505664).

Almost surely, 2^{66506255222540} is an apocalyptic number.

It is an amenable number.

66506255222540 is an abundant number, since it is smaller than the sum of its proper divisors (93129481049332).

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

66506255222540 is a wasteful number, since it uses less digits than its factorization.

66506255222540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61677806 (or 61677804 counting only the distinct ones).

The product of its (nonzero) digits is 8640000, while the sum is 50.

The spelling of 66506255222540 in words is "sixty-six trillion, five hundred six billion, two hundred fifty-five million, two hundred twenty-two thousand, five hundred forty".