1553645805 has 16 divisors (see below), whose sum is σ = 2491920960. Its totient is φ = 826581888.

The previous prime is 1553645803. The next prime is 1553645809. The reversal of 1553645805 is 5085463551.

It is a happy number.

1553645805 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1553645805 - 2¹ = 1553645803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1553645803) 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, 120487 + ... + 132756.

It is an arithmetic number, because the mean of its divisors is an integer number (155745060).

Almost surely, 2^1553645805 is an apocalyptic number.

1553645805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1553645805 is a deficient number, since it is larger than the sum of its proper divisors (938275155).

1553645805 is a wasteful number, since it uses less digits than its factorization.

1553645805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253660.

The product of its (nonzero) digits is 360000, while the sum is 42.

The square root of 1553645805 is about 39416.3139448630. The cubic root of 1553645805 is about 1158.2011867030.

The spelling of 1553645805 in words is "one billion, five hundred fifty-three million, six hundred forty-five thousand, eight hundred five".