61115111023 has 4 divisors (see below), whose sum is σ = 61116478048. Its totient is φ = 61113744000.

The previous prime is 61115110963. The next prime is 61115111051. The reversal of 61115111023 is 32011151116.

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

It is a cyclic number.

It is not a de Polignac number, because 61115111023 - 2²⁹ = 60578240111 is a prime.

It is a super-2 number, since 2×61115111023² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61115110985 and 61115111003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61115111093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614103 + ... + 706648.

It is an arithmetic number, because the mean of its divisors is an integer number (15279119512).

Almost surely, 2^61115111023 is an apocalyptic number.

61115111023 is a deficient number, since it is larger than the sum of its proper divisors (1367025).

61115111023 is a wasteful number, since it uses less digits than its factorization.

61115111023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367024.

The product of its (nonzero) digits is 180, while the sum is 22.

Adding to 61115111023 its reverse (32011151116), we get a palindrome (93126262139).

The spelling of 61115111023 in words is "sixty-one billion, one hundred fifteen million, one hundred eleven thousand, twenty-three".