66623261031 has 24 divisors (see below), whose sum is σ = 97710986880. Its totient is φ = 43738457616.

The previous prime is 66623261011. The next prime is 66623261039. The reversal of 66623261031 is 13016232666.

66623261031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66623261031 - 2¹¹ = 66623258983 is a prime.

It is a super-2 number, since 2×66623261031² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66623261039) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34821 + ... + 366686.

It is an arithmetic number, because the mean of its divisors is an integer number (4071291120).

Almost surely, 2^66623261031 is an apocalyptic number.

66623261031 is a deficient number, since it is larger than the sum of its proper divisors (31087725849).

66623261031 is a wasteful number, since it uses less digits than its factorization.

66623261031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401795 (or 401792 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

Adding to 66623261031 its reverse (13016232666), we get a palindrome (79639493697).

The spelling of 66623261031 in words is "sixty-six billion, six hundred twenty-three million, two hundred sixty-one thousand, thirty-one".