64861770721190 has 8 divisors (see below), whose sum is σ = 116751187298160. Its totient is φ = 25944708288472.

The previous prime is 64861770721183. The next prime is 64861770721207. The reversal of 64861770721190 is 9112707716846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×64861770721190² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3243088536050 + ... + 3243088536069.

It is an arithmetic number, because the mean of its divisors is an integer number (14593898412270).

Almost surely, 2^{64861770721190} is an apocalyptic number.

64861770721190 is a deficient number, since it is larger than the sum of its proper divisors (51889416576970).

64861770721190 is a wasteful number, since it uses less digits than its factorization.

64861770721190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6486177072126.

The product of its (nonzero) digits is 7112448, while the sum is 59.

The spelling of 64861770721190 in words is "sixty-four trillion, eight hundred sixty-one billion, seven hundred seventy million, seven hundred twenty-one thousand, one hundred ninety".