61365123645 has 32 divisors (see below), whose sum is σ = 112506654720. Its totient is φ = 27978592320.

The previous prime is 61365123641. The next prime is 61365123671. The reversal of 61365123645 is 54632156316.

It is not a de Polignac number, because 61365123645 - 2² = 61365123641 is a prime.

It is a super-2 number, since 2×61365123645² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61365123597 and 61365123606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61365123641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 731221 + ... + 810810.

It is an arithmetic number, because the mean of its divisors is an integer number (3515832960).

Almost surely, 2^61365123645 is an apocalyptic number.

It is an amenable number.

61365123645 is a deficient number, since it is larger than the sum of its proper divisors (51141531075).

61365123645 is a wasteful number, since it uses less digits than its factorization.

61365123645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542425.

The product of its digits is 388800, while the sum is 42.

The spelling of 61365123645 in words is "sixty-one billion, three hundred sixty-five million, one hundred twenty-three thousand, six hundred forty-five".