64736691043789 has 4 divisors (see below), whose sum is σ = 66114067449024. Its totient is φ = 63359314638556.

The previous prime is 64736691043757. The next prime is 64736691043807. The reversal of 64736691043789 is 98734019663746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64736691043789 - 2⁵ = 64736691043757 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 (64736691043589) 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, 688688202547 + ... + 688688202640.

It is an arithmetic number, because the mean of its divisors is an integer number (16528516862256).

Almost surely, 2^{64736691043789} is an apocalyptic number.

It is an amenable number.

64736691043789 is a deficient number, since it is larger than the sum of its proper divisors (1377376405235).

64736691043789 is a wasteful number, since it uses less digits than its factorization.

64736691043789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377376405234.

The product of its (nonzero) digits is 987614208, while the sum is 73.

The spelling of 64736691043789 in words is "sixty-four trillion, seven hundred thirty-six billion, six hundred ninety-one million, forty-three thousand, seven hundred eighty-nine".