40446631861 has 2 divisors, whose sum is σ = 40446631862. Its totient is φ = 40446631860.

The previous prime is 40446631837. The next prime is 40446631867. The reversal of 40446631861 is 16813664404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34451072100 + 5995559761 = 185610^2 + 77431^2 .

It is a cyclic number.

It is not a de Polignac number, because 40446631861 - 2³¹ = 38299148213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40446631867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20223315930 + 20223315931.

It is an arithmetic number, because the mean of its divisors is an integer number (20223315931).

Almost surely, 2^40446631861 is an apocalyptic number.

It is an amenable number.

40446631861 is a deficient number, since it is larger than the sum of its proper divisors (1).

40446631861 is an equidigital number, since it uses as much as digits as its factorization.

40446631861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 43.

The spelling of 40446631861 in words is "forty billion, four hundred forty-six million, six hundred thirty-one thousand, eight hundred sixty-one".