40450721751 has 24 divisors (see below), whose sum is σ = 64325323920. Its totient is φ = 24290668800.

The previous prime is 40450721747. The next prime is 40450721767. The reversal of 40450721751 is 15712705404.

It is not a de Polignac number, because 40450721751 - 2² = 40450721747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40450721351) 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 23 ways as a sum of consecutive naturals, for example, 1863490 + ... + 1885071.

It is an arithmetic number, because the mean of its divisors is an integer number (2680221830).

Almost surely, 2^40450721751 is an apocalyptic number.

40450721751 is a deficient number, since it is larger than the sum of its proper divisors (23874602169).

40450721751 is a wasteful number, since it uses less digits than its factorization.

40450721751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3748687 (or 3748684 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The spelling of 40450721751 in words is "forty billion, four hundred fifty million, seven hundred twenty-one thousand, seven hundred fifty-one".