64121670181 has 16 divisors (see below), whose sum is σ = 66995140608. Its totient is φ = 61310088000.

The previous prime is 64121670131. The next prime is 64121670187. The reversal of 64121670181 is 18107612146.

It is a cyclic number.

It is not a de Polignac number, because 64121670181 - 2²⁷ = 63987452453 is a prime.

It is a super-2 number, since 2×64121670181² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

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 64121670181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64121670187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2585466 + ... + 2610148.

It is an arithmetic number, because the mean of its divisors is an integer number (4187196288).

Almost surely, 2^64121670181 is an apocalyptic number.

64121670181 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

64121670181 is a deficient number, since it is larger than the sum of its proper divisors (2873470427).

64121670181 is a wasteful number, since it uses less digits than its factorization.

64121670181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25932.

The product of its (nonzero) digits is 16128, while the sum is 37.

The spelling of 64121670181 in words is "sixty-four billion, one hundred twenty-one million, six hundred seventy thousand, one hundred eighty-one".