1320670155 has 32 divisors (see below), whose sum is σ = 2466330624. Its totient is φ = 590887296.

The previous prime is 1320670123. The next prime is 1320670159. The reversal of 1320670155 is 5510760231.

It is not a de Polignac number, because 1320670155 - 2⁵ = 1320670123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1320670159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128872 + ... + 138741.

It is an arithmetic number, because the mean of its divisors is an integer number (77072832).

Almost surely, 2^1320670155 is an apocalyptic number.

1320670155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1320670155 is a deficient number, since it is larger than the sum of its proper divisors (1145660469).

1320670155 is a wasteful number, since it uses less digits than its factorization.

1320670155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267675.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 1320670155 is about 36341.0257835411. The cubic root of 1320670155 is about 1097.1469190054.

The spelling of 1320670155 in words is "one billion, three hundred twenty million, six hundred seventy thousand, one hundred fifty-five".