40015512501521 has 2 divisors, whose sum is σ = 40015512501522. Its totient is φ = 40015512501520.

The previous prime is 40015512501421. The next prime is 40015512501541. The reversal of 40015512501521 is 12510521551004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37769186000896 + 2246326500625 = 6145664^2 + 1498775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40015512501521 is a prime.

It is not a weakly prime, because it can be changed into another prime (40015512501541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20007756250760 + 20007756250761.

It is an arithmetic number, because the mean of its divisors is an integer number (20007756250761).

Almost surely, 2^{40015512501521} is an apocalyptic number.

It is an amenable number.

40015512501521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40015512501521 is an equidigital number, since it uses as much as digits as its factorization.

40015512501521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10000, while the sum is 32.

The spelling of 40015512501521 in words is "forty trillion, fifteen billion, five hundred twelve million, five hundred one thousand, five hundred twenty-one".