40306210661 has 2 divisors, whose sum is σ = 40306210662. Its totient is φ = 40306210660.

The previous prime is 40306210631. The next prime is 40306210727. The reversal of 40306210661 is 16601260304.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28331285761 + 11974924900 = 168319^2 + 109430^2 .

It is a cyclic number.

It is not a de Polignac number, because 40306210661 - 2¹⁴ = 40306194277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40306210601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20153105330 + 20153105331.

It is an arithmetic number, because the mean of its divisors is an integer number (20153105331).

Almost surely, 2^40306210661 is an apocalyptic number.

It is an amenable number.

40306210661 is a deficient number, since it is larger than the sum of its proper divisors (1).

40306210661 is an equidigital number, since it uses as much as digits as its factorization.

40306210661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 40306210661 its reverse (16601260304), we get a palindrome (56907470965).

The spelling of 40306210661 in words is "forty billion, three hundred six million, two hundred ten thousand, six hundred sixty-one".