145991222658 has 18 divisors (see below), whose sum is σ = 316317828099. Its totient is φ = 48663200532.

The previous prime is 145991222617. The next prime is 145991222693. The reversal of 145991222658 is 856222199541.

145991222658 is a `hidden beast` number, since 1 + 4 + 599 + 1 + 22 + 26 + 5 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 72995611329 + 72995611329 = 270177^2 + 270177^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=270177.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1576033 + ... + 1666091.

Almost surely, 2^145991222658 is an apocalyptic number.

145991222658 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

145991222658 is an abundant number, since it is smaller than the sum of its proper divisors (170326605441).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145991222658 is an frugal number, since it uses more digits than its factorization.

145991222658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180126 (or 90064 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The spelling of 145991222658 in words is "one hundred forty-five billion, nine hundred ninety-one million, two hundred twenty-two thousand, six hundred fifty-eight".