618041921965 has 16 divisors (see below), whose sum is σ = 799636744368. Its totient is φ = 455865094656.

The previous prime is 618041921951. The next prime is 618041922089. The reversal of 618041921965 is 569129140816.

It can be written as a sum of positive squares in 8 ways, for example, as 261109758121 + 356932163844 = 510989^2 + 597438^2 .

It is a cyclic number.

It is not a de Polignac number, because 618041921965 - 2⁷ = 618041921837 is a prime.

It is a super-2 number, since 2×618041921965² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5518024 + ... + 5628913.

It is an arithmetic number, because the mean of its divisors is an integer number (49977296523).

Almost surely, 2^618041921965 is an apocalyptic number.

618041921965 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

618041921965 is a deficient number, since it is larger than the sum of its proper divisors (181594822403).

618041921965 is a wasteful number, since it uses less digits than its factorization.

618041921965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11147808.

The product of its (nonzero) digits is 933120, while the sum is 52.

The spelling of 618041921965 in words is "six hundred eighteen billion, forty-one million, nine hundred twenty-one thousand, nine hundred sixty-five".