1616670813 has 8 divisors (see below), whose sum is σ = 2158228800. Its totient is φ = 1076446688.

The previous prime is 1616670793. The next prime is 1616670821. The reversal of 1616670813 is 3180766161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1616670813 - 2⁸ = 1616670557 is a prime.

It is a super-2 number, since 2×1616670813² = 5227249035212161938, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616671813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330633 + ... + 335486.

It is an arithmetic number, because the mean of its divisors is an integer number (269778600).

Almost surely, 2^1616670813 is an apocalyptic number.

It is an amenable number.

1616670813 is a deficient number, since it is larger than the sum of its proper divisors (541557987).

1616670813 is an equidigital number, since it uses as much as digits as its factorization.

1616670813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666931.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 1616670813 is about 40207.8451673302. The cubic root of 1616670813 is about 1173.6552142811.

The spelling of 1616670813 in words is "one billion, six hundred sixteen million, six hundred seventy thousand, eight hundred thirteen".