64606090991 has 8 divisors (see below), whose sum is σ = 69587985600. Its totient is φ = 59625938592.

The previous prime is 64606090961. The next prime is 64606090993. The reversal of 64606090991 is 19909060646.

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 64606090991 - 2¹⁰ = 64606089967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64606090993) 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, 358016 + ... + 507333.

It is an arithmetic number, because the mean of its divisors is an integer number (8698498200).

Almost surely, 2^64606090991 is an apocalyptic number.

64606090991 is a deficient number, since it is larger than the sum of its proper divisors (4981894609).

64606090991 is a wasteful number, since it uses less digits than its factorization.

64606090991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871105.

The product of its (nonzero) digits is 629856, while the sum is 50.

The spelling of 64606090991 in words is "sixty-four billion, six hundred six million, ninety thousand, nine hundred ninety-one".