618770161 has 4 divisors (see below), whose sum is σ = 620956912. Its totient is φ = 616583412.

The previous prime is 618770143. The next prime is 618770179. The reversal of 618770161 is 161077816.

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 an interprime number because it is at equal distance from previous prime (618770143) and next prime (618770179).

It is a cyclic number.

It is not a de Polignac number, because 618770161 - 2⁹ = 618769649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 618770161.

It is not an unprimeable number, because it can be changed into a prime (618770101) 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, 1092951 + ... + 1093516.

It is an arithmetic number, because the mean of its divisors is an integer number (155239228).

Almost surely, 2^618770161 is an apocalyptic number.

It is an amenable number.

618770161 is a deficient number, since it is larger than the sum of its proper divisors (2186751).

618770161 is a wasteful number, since it uses less digits than its factorization.

618770161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186750.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 618770161 is about 24875.0911757123. The cubic root of 618770161 is about 852.1377154194.

The spelling of 618770161 in words is "six hundred eighteen million, seven hundred seventy thousand, one hundred sixty-one".