1550220645 has 16 divisors (see below), whose sum is σ = 2481275520. Its totient is φ = 826476864.

The previous prime is 1550220643. The next prime is 1550220647. The reversal of 1550220645 is 5460220551.

It is an interprime number because it is at equal distance from previous prime (1550220643) and next prime (1550220647).

It is not a de Polignac number, because 1550220645 - 2¹ = 1550220643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1550220643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25872 + ... + 61398.

It is an arithmetic number, because the mean of its divisors is an integer number (155079720).

Almost surely, 2^1550220645 is an apocalyptic number.

1550220645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1550220645 is a deficient number, since it is larger than the sum of its proper divisors (931054875).

1550220645 is a wasteful number, since it uses less digits than its factorization.

1550220645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38444.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 1550220645 is about 39372.8414646441. The cubic root of 1550220645 is about 1157.3494389050.

The spelling of 1550220645 in words is "one billion, five hundred fifty million, two hundred twenty thousand, six hundred forty-five".