139066668450 has 120 divisors (see below), whose sum is σ = 392734426260. Its totient is φ = 36476438400.

The previous prime is 139066668421. The next prime is 139066668457. The reversal of 139066668450 is 54866660931.

It can be written as a sum of positive squares in 6 ways, for example, as 49693772241 + 89372896209 = 222921^2 + 298953^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (139066668457) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 34405 + ... + 528504.

Almost surely, 2^139066668450 is an apocalyptic number.

139066668450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 139066668450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196367213130).

139066668450 is an abundant number, since it is smaller than the sum of its proper divisors (253667757810).

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

139066668450 is a wasteful number, since it uses less digits than its factorization.

139066668450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562994 (or 562980 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 139066668450 in words is "one hundred thirty-nine billion, sixty-six million, six hundred sixty-eight thousand, four hundred fifty".