40719607681 has 3 divisors (see below), whose sum is σ = 40719809473. Its totient is φ = 40719405890.

The previous prime is 40719607651. The next prime is 40719607699. The reversal of 40719607681 is 18670691704.

The square root of 40719607681 is 201791.

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 is not a de Polignac number, because 40719607681 - 2¹⁹ = 40719083393 is a prime.

It is a super-2 number, since 2×40719607681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40719607631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 100896 + ... + 302686.

Almost surely, 2^40719607681 is an apocalyptic number.

40719607681 is the 201791-st square number.

40719607681 is the 100896-th centered octagonal number.

It is an amenable number.

40719607681 is a deficient number, since it is larger than the sum of its proper divisors (201792).

40719607681 is an frugal number, since it uses more digits than its factorization.

40719607681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403582 (or 201791 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 49.

Multiplying 40719607681 by its sum of digits (49), we get a square (1995260776369 = 1412537²).

The spelling of 40719607681 in words is "forty billion, seven hundred nineteen million, six hundred seven thousand, six hundred eighty-one".