66557121132 has 24 divisors (see below), whose sum is σ = 155315514816. Its totient is φ = 22183483408.

The previous prime is 66557121131. The next prime is 66557121133. The reversal of 66557121132 is 23112175566.

It is an interprime number because it is at equal distance from previous prime (66557121131) and next prime (66557121133).

It is a super-2 number, since 2×66557121132² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66557121131) 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, 150918 + ... + 394829.

It is an arithmetic number, because the mean of its divisors is an integer number (6471479784).

Almost surely, 2^66557121132 is an apocalyptic number.

It is an amenable number.

66557121132 is an abundant number, since it is smaller than the sum of its proper divisors (88758393684).

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

66557121132 is a wasteful number, since it uses less digits than its factorization.

66557121132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555917 (or 555915 counting only the distinct ones).

The product of its digits is 75600, while the sum is 39.

Adding to 66557121132 its reverse (23112175566), we get a palindrome (89669296698).

The spelling of 66557121132 in words is "sixty-six billion, five hundred fifty-seven million, one hundred twenty-one thousand, one hundred thirty-two".