61644684134726 has 64 divisors (see below), whose sum is σ = 122288107636224. Its totient is φ = 22563295372800.

The previous prime is 61644684134707. The next prime is 61644684134741. The reversal of 61644684134726 is 62743148644616.

It is a super-2 number, since 2×61644684134726² (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 31 ways as a sum of consecutive naturals, for example, 20091245 + ... + 22955336.

It is an arithmetic number, because the mean of its divisors is an integer number (1910751681816).

Almost surely, 2^{61644684134726} is an apocalyptic number.

61644684134726 is a deficient number, since it is larger than the sum of its proper divisors (60643423501498).

61644684134726 is a wasteful number, since it uses less digits than its factorization.

61644684134726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43047165.

The product of its digits is 111476736, while the sum is 62.

The spelling of 61644684134726 in words is "sixty-one trillion, six hundred forty-four billion, six hundred eighty-four million, one hundred thirty-four thousand, seven hundred twenty-six".