61143808787 has 16 divisors (see below), whose sum is σ = 64798390272. Its totient is φ = 57573426240.

The previous prime is 61143808673. The next prime is 61143808823. The reversal of 61143808787 is 78780834116.

It is a cyclic number.

It is not a de Polignac number, because 61143808787 - 2¹⁸ = 61143546643 is a prime.

It is a super-2 number, since 2×61143808787² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61143801787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2402087 + ... + 2427407.

It is an arithmetic number, because the mean of its divisors is an integer number (4049899392).

Almost surely, 2^61143808787 is an apocalyptic number.

61143808787 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

61143808787 is a deficient number, since it is larger than the sum of its proper divisors (3654581485).

61143808787 is a wasteful number, since it uses less digits than its factorization.

61143808787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26978.

The product of its (nonzero) digits is 1806336, while the sum is 53.

The spelling of 61143808787 in words is "sixty-one billion, one hundred forty-three million, eight hundred eight thousand, seven hundred eighty-seven".