40768051921 has 3 divisors (see below), whose sum is σ = 40768253833. Its totient is φ = 40767850010.

The previous prime is 40768051913. The next prime is 40768051957. The reversal of 40768051921 is 12915086704.

The square root of 40768051921 is 201911.

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 40768051921 - 2³ = 40768051913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40768051901) 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, 100956 + ... + 302866.

Almost surely, 2^40768051921 is an apocalyptic number.

40768051921 is the 201911-st square number.

40768051921 is the 100956-th centered octagonal number.

It is an amenable number.

40768051921 is a deficient number, since it is larger than the sum of its proper divisors (201912).

40768051921 is an frugal number, since it uses more digits than its factorization.

40768051921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403822 (or 201911 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 40768051921 in words is "forty billion, seven hundred sixty-eight million, fifty-one thousand, nine hundred twenty-one".