61644128467814 has 4 divisors (see below), whose sum is σ = 92466192701724. Its totient is φ = 30822064233906.

The previous prime is 61644128467807. The next prime is 61644128467897. The reversal of 61644128467814 is 41876482144616.

It is a happy number.

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

It is a super-2 number, since 2×61644128467814² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15411032116952 + ... + 15411032116955.

It is an arithmetic number, because the mean of its divisors is an integer number (23116548175431).

Almost surely, 2^{61644128467814} is an apocalyptic number.

61644128467814 is a deficient number, since it is larger than the sum of its proper divisors (30822064233910).

61644128467814 is a wasteful number, since it uses less digits than its factorization.

61644128467814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30822064233909.

The product of its digits is 49545216, while the sum is 62.

The spelling of 61644128467814 in words is "sixty-one trillion, six hundred forty-four billion, one hundred twenty-eight million, four hundred sixty-seven thousand, eight hundred fourteen".