64121077919 has 8 divisors (see below), whose sum is σ = 67278617952. Its totient is φ = 60994343520.

The previous prime is 64121077907. The next prime is 64121077973. The reversal of 64121077919 is 91977012146.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64121077919 - 2²⁴ = 64104300703 is a prime.

It is a super-2 number, since 2×64121077919² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64121077019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7697144 + ... + 7705469.

It is an arithmetic number, because the mean of its divisors is an integer number (8409827244).

Almost surely, 2^64121077919 is an apocalyptic number.

64121077919 is a deficient number, since it is larger than the sum of its proper divisors (3157540033).

64121077919 is a wasteful number, since it uses less digits than its factorization.

64121077919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15402817.

The product of its (nonzero) digits is 190512, while the sum is 47.

The spelling of 64121077919 in words is "sixty-four billion, one hundred twenty-one million, seventy-seven thousand, nine hundred nineteen".