66748687542 has 24 divisors (see below), whose sum is σ = 152233849560. Its totient is φ = 21078532800.

The previous prime is 66748687513. The next prime is 66748687543. The reversal of 66748687542 is 24578684766.

66748687542 is a `hidden beast` number, since 6 + 6 + 7 + 4 + 8 + 6 + 87 + 542 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 66748687542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66748687543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97585459 + ... + 97586142.

It is an arithmetic number, because the mean of its divisors is an integer number (6343077065).

Almost surely, 2^66748687542 is an apocalyptic number.

66748687542 is an abundant number, since it is smaller than the sum of its proper divisors (85485162018).

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

66748687542 is a wasteful number, since it uses less digits than its factorization.

66748687542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195171628 (or 195171625 counting only the distinct ones).

The product of its digits is 108380160, while the sum is 63.

The spelling of 66748687542 in words is "sixty-six billion, seven hundred forty-eight million, six hundred eighty-seven thousand, five hundred forty-two".