140521640857 has 16 divisors (see below), whose sum is σ = 158116210560. Its totient is φ = 123911073792.

The previous prime is 140521640797. The next prime is 140521640863. The reversal of 140521640857 is 758046125041.

It is a cyclic number.

It is not a de Polignac number, because 140521640857 - 2²⁷ = 140387423129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140521640887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75643 + ... + 535504.

It is an arithmetic number, because the mean of its divisors is an integer number (9882263160).

Almost surely, 2^140521640857 is an apocalyptic number.

It is an amenable number.

140521640857 is a deficient number, since it is larger than the sum of its proper divisors (17594569703).

140521640857 is a wasteful number, since it uses less digits than its factorization.

140521640857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611952.

The product of its (nonzero) digits is 268800, while the sum is 43.

Adding to 140521640857 its reverse (758046125041), we get a palindrome (898567765898).

The spelling of 140521640857 in words is "one hundred forty billion, five hundred twenty-one million, six hundred forty thousand, eight hundred fifty-seven".