40011542947661 has 2 divisors, whose sum is σ = 40011542947662. Its totient is φ = 40011542947660.

The previous prime is 40011542947637. The next prime is 40011542947697. The reversal of 40011542947661 is 16674924511004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38763449560900 + 1248093386761 = 6226030^2 + 1117181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40011542947661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40011542941661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20005771473830 + 20005771473831.

It is an arithmetic number, because the mean of its divisors is an integer number (20005771473831).

Almost surely, 2^{40011542947661} is an apocalyptic number.

It is an amenable number.

40011542947661 is a deficient number, since it is larger than the sum of its proper divisors (1).

40011542947661 is an equidigital number, since it uses as much as digits as its factorization.

40011542947661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 40011542947661 in words is "forty trillion, eleven billion, five hundred forty-two million, nine hundred forty-seven thousand, six hundred sixty-one".