64642446040591 has 16 divisors (see below), whose sum is σ = 66644557185024. Its totient is φ = 62667163810944.

The previous prime is 64642446040483. The next prime is 64642446040619. The reversal of 64642446040591 is 19504064424646.

It is a cyclic number.

It is not a de Polignac number, because 64642446040591 - 2¹⁵ = 64642446007823 is a prime.

It is a super-2 number, since 2×64642446040591² (a number of 28 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 (64642446044591) 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, 4438666 + ... + 12206008.

It is an arithmetic number, because the mean of its divisors is an integer number (4165284824064).

Almost surely, 2^{64642446040591} is an apocalyptic number.

64642446040591 is a deficient number, since it is larger than the sum of its proper divisors (2002111144433).

64642446040591 is a wasteful number, since it uses less digits than its factorization.

64642446040591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7769070.

The product of its (nonzero) digits is 19906560, while the sum is 55.

The spelling of 64642446040591 in words is "sixty-four trillion, six hundred forty-two billion, four hundred forty-six million, forty thousand, five hundred ninety-one".