149979437809 has 2 divisors, whose sum is σ = 149979437810. Its totient is φ = 149979437808.

The previous prime is 149979437791. The next prime is 149979437819. The reversal of 149979437809 is 908734979941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101233421584 + 48746016225 = 318172^2 + 220785^2 .

It is a cyclic number.

It is not a de Polignac number, because 149979437809 - 2³⁷ = 12540484337 is a prime.

It is not a weakly prime, because it can be changed into another prime (149979437819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74989718904 + 74989718905.

It is an arithmetic number, because the mean of its divisors is an integer number (74989718905).

Almost surely, 2^149979437809 is an apocalyptic number.

It is an amenable number.

149979437809 is a deficient number, since it is larger than the sum of its proper divisors (1).

149979437809 is an equidigital number, since it uses as much as digits as its factorization.

149979437809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 123451776, while the sum is 70.

The spelling of 149979437809 in words is "one hundred forty-nine billion, nine hundred seventy-nine million, four hundred thirty-seven thousand, eight hundred nine".