40251502609 has 2 divisors, whose sum is σ = 40251502610. Its totient is φ = 40251502608.

The previous prime is 40251502601. The next prime is 40251502619. The reversal of 40251502609 is 90620515204.

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., 23377492609 + 16874010000 = 152897^2 + 129900^2 .

It is a cyclic number.

It is not a de Polignac number, because 40251502609 - 2³ = 40251502601 is a prime.

It is not a weakly prime, because it can be changed into another prime (40251502601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20125751304 + 20125751305.

It is an arithmetic number, because the mean of its divisors is an integer number (20125751305).

Almost surely, 2^40251502609 is an apocalyptic number.

It is an amenable number.

40251502609 is a deficient number, since it is larger than the sum of its proper divisors (1).

40251502609 is an equidigital number, since it uses as much as digits as its factorization.

40251502609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 40251502609 in words is "forty billion, two hundred fifty-one million, five hundred two thousand, six hundred nine".