140821726661 has 48 divisors (see below), whose sum is σ = 186048109440. Its totient is φ = 105270721920.

The previous prime is 140821726627. The next prime is 140821726691. The reversal of 140821726661 is 166627128041.

It is a de Polignac number, because none of the positive numbers 2^k-140821726661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140821726691) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2425376 + ... + 2482758.

It is an arithmetic number, because the mean of its divisors is an integer number (3876002280).

Almost surely, 2^140821726661 is an apocalyptic number.

140821726661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

140821726661 is a deficient number, since it is larger than the sum of its proper divisors (45226382779).

140821726661 is a wasteful number, since it uses less digits than its factorization.

140821726661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57594 (or 57587 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 140821726661 in words is "one hundred forty billion, eight hundred twenty-one million, seven hundred twenty-six thousand, six hundred sixty-one".