66881481540 has 24 divisors (see below), whose sum is σ = 187268148480. Its totient is φ = 17835061728.

The previous prime is 66881481451. The next prime is 66881481559. The reversal of 66881481540 is 4518418866.

66881481540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557345620 + ... + 557345739.

It is an arithmetic number, because the mean of its divisors is an integer number (7802839520).

Almost surely, 2^66881481540 is an apocalyptic number.

66881481540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66881481540 is an abundant number, since it is smaller than the sum of its proper divisors (120386666940).

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

66881481540 is a wasteful number, since it uses less digits than its factorization.

66881481540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114691371 (or 1114691369 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 51.

The spelling of 66881481540 in words is "sixty-six billion, eight hundred eighty-one million, four hundred eighty-one thousand, five hundred forty".