64540899365669 has 8 divisors (see below), whose sum is σ = 64818145259712. Its totient is φ = 64263655577440.

The previous prime is 64540899365639. The next prime is 64540899365707. The reversal of 64540899365669 is 96656399804546.

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 64540899365669 - 2¹² = 64540899361573 is a prime.

It is a super-2 number, since 2×64540899365669² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64540899365593 and 64540899365602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64540899365629) 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, 121071824 + ... + 121603734.

It is an arithmetic number, because the mean of its divisors is an integer number (8102268157464).

Almost surely, 2^{64540899365669} is an apocalyptic number.

It is an amenable number.

64540899365669 is a deficient number, since it is larger than the sum of its proper divisors (277245894043).

64540899365669 is a wasteful number, since it uses less digits than its factorization.

64540899365669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052907.

The product of its (nonzero) digits is 9069926400, while the sum is 80.

The spelling of 64540899365669 in words is "sixty-four trillion, five hundred forty billion, eight hundred ninety-nine million, three hundred sixty-five thousand, six hundred sixty-nine".