149498400818 has 18 divisors (see below), whose sum is σ = 242835872157. Its totient is φ = 68995981080.

The previous prime is 149498400817. The next prime is 149498400839. The reversal of 149498400818 is 818004894941.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 127825555729 + 21672845089 = 357527^2 + 147217^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=273403.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (149498400817) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7097963 + ... + 7118993.

Almost surely, 2^149498400818 is an apocalyptic number.

149498400818 is a deficient number, since it is larger than the sum of its proper divisors (93337471339).

149498400818 is an frugal number, since it uses more digits than its factorization.

149498400818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42090 (or 21046 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 56.

The spelling of 149498400818 in words is "one hundred forty-nine billion, four hundred ninety-eight million, four hundred thousand, eight hundred eighteen".