66421740972 has 24 divisors (see below), whose sum is σ = 155023678656. Its totient is φ = 22134920848.

The previous prime is 66421740967. The next prime is 66421740977. The reversal of 66421740972 is 27904712466.

It is an interprime number because it is at equal distance from previous prime (66421740967) and next prime (66421740977).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66421740977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 658398 + ... + 752549.

It is an arithmetic number, because the mean of its divisors is an integer number (6459319944).

Almost surely, 2^66421740972 is an apocalyptic number.

It is an amenable number.

66421740972 is an abundant number, since it is smaller than the sum of its proper divisors (88601937684).

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

66421740972 is a wasteful number, since it uses less digits than its factorization.

66421740972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414877 (or 1414875 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 48.

The spelling of 66421740972 in words is "sixty-six billion, four hundred twenty-one million, seven hundred forty thousand, nine hundred seventy-two".