140732521638 has 16 divisors (see below), whose sum is σ = 281622925056. Its totient is φ = 46884526920.

The previous prime is 140732521627. The next prime is 140732521639. The reversal of 140732521638 is 836125237041.

It is a self number, because there is not a number n which added to its sum of digits gives 140732521638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140732521639) 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, 6566818 + ... + 6588213.

It is an arithmetic number, because the mean of its divisors is an integer number (17601432816).

Almost surely, 2^140732521638 is an apocalyptic number.

140732521638 is an abundant number, since it is smaller than the sum of its proper divisors (140890403418).

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

140732521638 is a wasteful number, since it uses less digits than its factorization.

140732521638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13156819.

The product of its (nonzero) digits is 241920, while the sum is 42.

Adding to 140732521638 its reverse (836125237041), we get a palindrome (976857758679).

The spelling of 140732521638 in words is "one hundred forty billion, seven hundred thirty-two million, five hundred twenty-one thousand, six hundred thirty-eight".