66679997748 has 96 divisors (see below), whose sum is σ = 191593430784. Its totient is φ = 17576552448.

The previous prime is 66679997731. The next prime is 66679997777. The reversal of 66679997748 is 84779997666.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2165436 + ... + 2196012.

It is an arithmetic number, because the mean of its divisors is an integer number (1995764904).

Almost surely, 2^66679997748 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66679997748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95796715392).

66679997748 is an abundant number, since it is smaller than the sum of its proper divisors (124913433036).

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

66679997748 is a wasteful number, since it uses less digits than its factorization.

66679997748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32601 (or 32599 counting only the distinct ones).

The product of its digits is 1728324864, while the sum is 78.

The spelling of 66679997748 in words is "sixty-six billion, six hundred seventy-nine million, nine hundred ninety-seven thousand, seven hundred forty-eight".