40675621621 has 2 divisors, whose sum is σ = 40675621622. Its totient is φ = 40675621620.

The previous prime is 40675621607. The next prime is 40675621631. The reversal of 40675621621 is 12612657604.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39486061521 + 1189560100 = 198711^2 + 34490^2 .

It is a cyclic number.

It is not a de Polignac number, because 40675621621 - 2²⁵ = 40642067189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40675621631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20337810810 + 20337810811.

It is an arithmetic number, because the mean of its divisors is an integer number (20337810811).

Almost surely, 2^40675621621 is an apocalyptic number.

It is an amenable number.

40675621621 is a deficient number, since it is larger than the sum of its proper divisors (1).

40675621621 is an equidigital number, since it uses as much as digits as its factorization.

40675621621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 40675621621 in words is "forty billion, six hundred seventy-five million, six hundred twenty-one thousand, six hundred twenty-one".