618961955 has 16 divisors (see below), whose sum is σ = 783955200. Its totient is φ = 467843040.

The previous prime is 618961951. The next prime is 618961997. The reversal of 618961955 is 559169816.

It is not a de Polignac number, because 618961955 - 2² = 618961951 is a prime.

It is a super-2 number, since 2×618961955² = 766227803474844050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (618961951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27410 + ... + 44600.

It is an arithmetic number, because the mean of its divisors is an integer number (48997200).

Almost surely, 2^618961955 is an apocalyptic number.

618961955 is a deficient number, since it is larger than the sum of its proper divisors (164993245).

618961955 is a wasteful number, since it uses less digits than its factorization.

618961955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17594.

The product of its digits is 583200, while the sum is 50.

The square root of 618961955 is about 24878.9460186721. The cubic root of 618961955 is about 852.2257491936.

It can be divided in two parts, 618961 and 955, that added together give a palindrome (619916).

The spelling of 618961955 in words is "six hundred eighteen million, nine hundred sixty-one thousand, nine hundred fifty-five".