155207645 has 4 divisors (see below), whose sum is σ = 186249180. Its totient is φ = 124166112.

The previous prime is 155207581. The next prime is 155207651. The reversal of 155207645 is 546702551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546702551 = 199 ⋅2747249.

It can be written as a sum of positive squares in 2 ways, for example, as 23921881 + 131285764 = 4891^2 + 11458^2 .

It is a cyclic number.

It is not a de Polignac number, because 155207645 - 2⁶ = 155207581 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15520760 + ... + 15520769.

It is an arithmetic number, because the mean of its divisors is an integer number (46562295).

Almost surely, 2^155207645 is an apocalyptic number.

It is an amenable number.

155207645 is a deficient number, since it is larger than the sum of its proper divisors (31041535).

155207645 is an equidigital number, since it uses as much as digits as its factorization.

155207645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31041534.

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 155207645 is about 12458.2360308352. The cubic root of 155207645 is about 537.4083002029.

The spelling of 155207645 in words is "one hundred fifty-five million, two hundred seven thousand, six hundred forty-five".