66794040721032 has 128 divisors (see below), whose sum is σ = 173076687912960. Its totient is φ = 21458428047360.

The previous prime is 66794040720991. The next prime is 66794040721039. The reversal of 66794040721032 is 23012704049766.

It is a happy number.

It is a super-2 number, since 2×66794040721032² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66794040721039) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 383749288 + ... + 383923304.

It is an arithmetic number, because the mean of its divisors is an integer number (1352161624320).

Almost surely, 2^{66794040721032} is an apocalyptic number.

66794040721032 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66794040721032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86538343956480).

66794040721032 is an abundant number, since it is smaller than the sum of its proper divisors (106282647191928).

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

66794040721032 is a wasteful number, since it uses less digits than its factorization.

66794040721032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176163 (or 176159 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 51.

The spelling of 66794040721032 in words is "sixty-six trillion, seven hundred ninety-four billion, forty million, seven hundred twenty-one thousand, thirty-two".