61123943857 has 8 divisors (see below), whose sum is σ = 61236796160. Its totient is φ = 61011163440.

The previous prime is 61123943851. The next prime is 61123943893. The reversal of 61123943857 is 75834932116.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61123943857 - 2³ = 61123943849 is a prime.

It is a super-2 number, since 2×61123943857² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61123943857.

It is not an unprimeable number, because it can be changed into a prime (61123943851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1862563 + ... + 1895095.

It is an arithmetic number, because the mean of its divisors is an integer number (7654599520).

Almost surely, 2^61123943857 is an apocalyptic number.

It is an amenable number.

61123943857 is a deficient number, since it is larger than the sum of its proper divisors (112852303).

61123943857 is a wasteful number, since it uses less digits than its factorization.

61123943857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35943.

The product of its digits is 1088640, while the sum is 49.

The spelling of 61123943857 in words is "sixty-one billion, one hundred twenty-three million, nine hundred forty-three thousand, eight hundred fifty-seven".