40352587721 has 2 divisors, whose sum is σ = 40352587722. Its totient is φ = 40352587720.

The previous prime is 40352587699. The next prime is 40352587783. The reversal of 40352587721 is 12778525304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20717572096 + 19635015625 = 143936^2 + 140125^2 .

It is a cyclic number.

It is not a de Polignac number, because 40352587721 - 2¹⁰ = 40352586697 is a prime.

It is not a weakly prime, because it can be changed into another prime (40352584721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20176293860 + 20176293861.

It is an arithmetic number, because the mean of its divisors is an integer number (20176293861).

Almost surely, 2^40352587721 is an apocalyptic number.

It is an amenable number.

40352587721 is a deficient number, since it is larger than the sum of its proper divisors (1).

40352587721 is an equidigital number, since it uses as much as digits as its factorization.

40352587721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 470400, while the sum is 44.

The spelling of 40352587721 in words is "forty billion, three hundred fifty-two million, five hundred eighty-seven thousand, seven hundred twenty-one".