618661073 has 4 divisors (see below), whose sum is σ = 621593328. Its totient is φ = 615728820.

The previous prime is 618661067. The next prime is 618661097. The reversal of 618661073 is 370166816.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 618661073 - 2⁶ = 618661009 is a prime.

It is a super-2 number, since 2×618661073² = 765483046491022658, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (618661273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1465811 + ... + 1466232.

It is an arithmetic number, because the mean of its divisors is an integer number (155398332).

Almost surely, 2^618661073 is an apocalyptic number.

It is an amenable number.

618661073 is a deficient number, since it is larger than the sum of its proper divisors (2932255).

618661073 is a wasteful number, since it uses less digits than its factorization.

618661073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932254.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 618661073 is about 24872.8983634799. The cubic root of 618661073 is about 852.0876357246.

The spelling of 618661073 in words is "six hundred eighteen million, six hundred sixty-one thousand, seventy-three".