140385851761 has 3 divisors (see below), whose sum is σ = 140386226443. Its totient is φ = 140385477080.

The previous prime is 140385851759. The next prime is 140385851773. The reversal of 140385851761 is 167158583041.

It is a happy number.

The square root of 140385851761 is 374681.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 20586797361 + 119799054400 = 143481^2 + 346120^2 .

It is not a de Polignac number, because 140385851761 - 2¹ = 140385851759 is a prime.

It is a super-2 number, since 2×140385851761² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140385851701) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 187341 + ... + 562021.

Almost surely, 2^140385851761 is an apocalyptic number.

140385851761 is the 374681-st square number.

140385851761 is the 187341-st centered octagonal number.

It is an amenable number.

140385851761 is a deficient number, since it is larger than the sum of its proper divisors (374682).

140385851761 is an frugal number, since it uses more digits than its factorization.

140385851761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749362 (or 374681 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 49.

Multiplying 140385851761 by its sum of digits (49), we get a square (6878906736289 = 2622767²).

The spelling of 140385851761 in words is "one hundred forty billion, three hundred eighty-five million, eight hundred fifty-one thousand, seven hundred sixty-one".