40212520637 has 2 divisors, whose sum is σ = 40212520638. Its totient is φ = 40212520636.

The previous prime is 40212520633. The next prime is 40212520639. The reversal of 40212520637 is 73602521204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40194636196 + 17884441 = 200486^2 + 4229^2 .

It is a cyclic number.

It is not a de Polignac number, because 40212520637 - 2² = 40212520633 is a prime.

Together with 40212520639, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40212520633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20106260318 + 20106260319.

It is an arithmetic number, because the mean of its divisors is an integer number (20106260319).

Almost surely, 2^40212520637 is an apocalyptic number.

It is an amenable number.

40212520637 is a deficient number, since it is larger than the sum of its proper divisors (1).

40212520637 is an equidigital number, since it uses as much as digits as its factorization.

40212520637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 40212520637 in words is "forty billion, two hundred twelve million, five hundred twenty thousand, six hundred thirty-seven".