66669934540 has 48 divisors (see below), whose sum is σ = 158001490080. Its totient is φ = 23407623680.

The previous prime is 66669934523. The next prime is 66669934543. The reversal of 66669934540 is 4543996666.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is not an unprimeable number, because it can be changed into a prime (66669934543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5218537 + ... + 5231296.

It is an arithmetic number, because the mean of its divisors is an integer number (3291697710).

Almost surely, 2^66669934540 is an apocalyptic number.

It is an amenable number.

66669934540 is an abundant number, since it is smaller than the sum of its proper divisors (91331555540).

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

66669934540 is a wasteful number, since it uses less digits than its factorization.

66669934540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10449882 (or 10449880 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 58.

The spelling of 66669934540 in words is "sixty-six billion, six hundred sixty-nine million, nine hundred thirty-four thousand, five hundred forty".