64121557366 has 4 divisors (see below), whose sum is σ = 96182336052. Its totient is φ = 32060778682.

The previous prime is 64121557309. The next prime is 64121557397. The reversal of 64121557366 is 66375512146.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×64121557366² (a number of 22 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 as a sum of consecutive naturals, namely, 16030389340 + ... + 16030389343.

It is an arithmetic number, because the mean of its divisors is an integer number (24045584013).

Almost surely, 2^64121557366 is an apocalyptic number.

64121557366 is a deficient number, since it is larger than the sum of its proper divisors (32060778686).

64121557366 is a wasteful number, since it uses less digits than its factorization.

64121557366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32060778685.

The product of its digits is 907200, while the sum is 46.

The spelling of 64121557366 in words is "sixty-four billion, one hundred twenty-one million, five hundred fifty-seven thousand, three hundred sixty-six".