61651688597 has 2 divisors, whose sum is σ = 61651688598. Its totient is φ = 61651688596.

The previous prime is 61651688569. The next prime is 61651688611. The reversal of 61651688597 is 79588615616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43048365361 + 18603323236 = 207481^2 + 136394^2 .

It is a cyclic number.

It is not a de Polignac number, because 61651688597 - 2²⁰ = 61650640021 is a prime.

It is a super-2 number, since 2×61651688597² (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 (61651688297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30825844298 + 30825844299.

It is an arithmetic number, because the mean of its divisors is an integer number (30825844299).

Almost surely, 2^61651688597 is an apocalyptic number.

It is an amenable number.

61651688597 is a deficient number, since it is larger than the sum of its proper divisors (1).

61651688597 is an equidigital number, since it uses as much as digits as its factorization.

61651688597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21772800, while the sum is 62.

The spelling of 61651688597 in words is "sixty-one billion, six hundred fifty-one million, six hundred eighty-eight thousand, five hundred ninety-seven".