61867826989 has 2 divisors, whose sum is σ = 61867826990. Its totient is φ = 61867826988.

The previous prime is 61867826897. The next prime is 61867827061. The reversal of 61867826989 is 98962876816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35614106089 + 26253720900 = 188717^2 + 162030^2 .

It is a cyclic number.

It is not a de Polignac number, because 61867826989 - 2¹³ = 61867818797 is a prime.

It is a super-2 number, since 2×61867826989² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61867826389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30933913494 + 30933913495.

It is an arithmetic number, because the mean of its divisors is an integer number (30933913495).

Almost surely, 2^61867826989 is an apocalyptic number.

It is an amenable number.

61867826989 is a deficient number, since it is larger than the sum of its proper divisors (1).

61867826989 is an equidigital number, since it uses as much as digits as its factorization.

61867826989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 125411328, while the sum is 70.

The spelling of 61867826989 in words is "sixty-one billion, eight hundred sixty-seven million, eight hundred twenty-six thousand, nine hundred eighty-nine".