66640153532 has 24 divisors (see below), whose sum is σ = 120449978880. Its totient is φ = 32227084080.

The previous prime is 66640153523. The next prime is 66640153549. The reversal of 66640153532 is 23535104666.

It is a self number, because there is not a number n which added to its sum of digits gives 66640153532.

It is a congruent number.

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, 71219 + ... + 371957.

It is an arithmetic number, because the mean of its divisors is an integer number (5018749120).

Almost surely, 2^66640153532 is an apocalyptic number.

66640153532 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

66640153532 is a deficient number, since it is larger than the sum of its proper divisors (53809825348).

66640153532 is a wasteful number, since it uses less digits than its factorization.

66640153532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302561 (or 302559 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 66640153532 in words is "sixty-six billion, six hundred forty million, one hundred fifty-three thousand, five hundred thirty-two".