64534963091 has 4 divisors (see below), whose sum is σ = 64590935592. Its totient is φ = 64478990592.

The previous prime is 64534963079. The next prime is 64534963099. The reversal of 64534963091 is 19036943546.

It is a happy number.

64534963091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19036943546 = 2 ⋅9518471773.

It is a cyclic number.

It is not a de Polignac number, because 64534963091 - 2²² = 64530768787 is a prime.

It is a super-2 number, since 2×64534963091² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64534963099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27984521 + ... + 27986826.

It is an arithmetic number, because the mean of its divisors is an integer number (16147733898).

Almost surely, 2^64534963091 is an apocalyptic number.

64534963091 is a deficient number, since it is larger than the sum of its proper divisors (55972501).

64534963091 is a wasteful number, since it uses less digits than its factorization.

64534963091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55972500.

The product of its (nonzero) digits is 2099520, while the sum is 50.

The spelling of 64534963091 in words is "sixty-four billion, five hundred thirty-four million, nine hundred sixty-three thousand, ninety-one".