61723145325812 has 6 divisors (see below), whose sum is σ = 108015504320178. Its totient is φ = 30861572662904.

The previous prime is 61723145325773. The next prime is 61723145325817. The reversal of 61723145325812 is 21852354132716.

It can be written as a sum of positive squares in only one way, i.e., 45885260585956 + 15837884739856 = 6773866^2 + 3979684^2 .

It is a super-2 number, since 2×61723145325812² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61723145325817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7715393165723 + ... + 7715393165730.

It is an arithmetic number, because the mean of its divisors is an integer number (18002584053363).

Almost surely, 2^{61723145325812} is an apocalyptic number.

It is an amenable number.

61723145325812 is a deficient number, since it is larger than the sum of its proper divisors (46292358994366).

61723145325812 is a wasteful number, since it uses less digits than its factorization.

61723145325812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15430786331457 (or 15430786331455 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 50.

The spelling of 61723145325812 in words is "sixty-one trillion, seven hundred twenty-three billion, one hundred forty-five million, three hundred twenty-five thousand, eight hundred twelve".