64537973869 has 8 divisors (see below), whose sum is σ = 64676393568. Its totient is φ = 64399629840.

The previous prime is 64537973861. The next prime is 64537973879. The reversal of 64537973869 is 96837973546.

64537973869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 64537973869 - 2³ = 64537973861 is a prime.

It is a super-2 number, since 2×64537973869² (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 (64537973861) 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, 1892679 + ... + 1926475.

It is an arithmetic number, because the mean of its divisors is an integer number (8084549196).

Almost surely, 2^64537973869 is an apocalyptic number.

It is an amenable number.

64537973869 is a deficient number, since it is larger than the sum of its proper divisors (138419699).

64537973869 is a wasteful number, since it uses less digits than its factorization.

64537973869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37835.

The product of its digits is 205752960, while the sum is 67.

The spelling of 64537973869 in words is "sixty-four billion, five hundred thirty-seven million, nine hundred seventy-three thousand, eight hundred sixty-nine".