145215555 has 16 divisors (see below), whose sum is σ = 235146240. Its totient is φ = 76514528.

The previous prime is 145215533. The next prime is 145215607. The reversal of 145215555 is 555512541.

It is a cyclic number.

It is not a de Polignac number, because 145215555 - 2⁵ = 145215523 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57075 + ... + 59564.

It is an arithmetic number, because the mean of its divisors is an integer number (14696640).

Almost surely, 2^145215555 is an apocalyptic number.

145215555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

145215555 is a deficient number, since it is larger than the sum of its proper divisors (89930685).

145215555 is a wasteful number, since it uses less digits than its factorization.

145215555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116730.

The product of its digits is 25000, while the sum is 33.

The square root of 145215555 is about 12050.5416890694. The cubic root of 145215555 is about 525.6189887301.

The spelling of 145215555 in words is "one hundred forty-five million, two hundred fifteen thousand, five hundred fifty-five".