149507553778 has 16 divisors (see below), whose sum is σ = 246670619040. Its totient is φ = 67957977780.

The previous prime is 149507553763. The next prime is 149507553869. The reversal of 149507553778 is 877355705941.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28079148 + ... + 28084471.

It is an arithmetic number, because the mean of its divisors is an integer number (15416913690).

Almost surely, 2^149507553778 is an apocalyptic number.

149507553778 is a deficient number, since it is larger than the sum of its proper divisors (97163065262).

149507553778 is an equidigital number, since it uses as much as digits as its factorization.

149507553778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56163654 (or 56163632 counting only the distinct ones).

The product of its (nonzero) digits is 37044000, while the sum is 61.

The spelling of 149507553778 in words is "one hundred forty-nine billion, five hundred seven million, five hundred fifty-three thousand, seven hundred seventy-eight".