61209859639 has 2 divisors, whose sum is σ = 61209859640. Its totient is φ = 61209859638.

The previous prime is 61209859619. The next prime is 61209859649. The reversal of 61209859639 is 93695890216.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61209859639 - 2⁷ = 61209859511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61209859619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30604929819 + 30604929820.

It is an arithmetic number, because the mean of its divisors is an integer number (30604929820).

Almost surely, 2^61209859639 is an apocalyptic number.

61209859639 is a deficient number, since it is larger than the sum of its proper divisors (1).

61209859639 is an equidigital number, since it uses as much as digits as its factorization.

61209859639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6298560, while the sum is 58.

The spelling of 61209859639 in words is "sixty-one billion, two hundred nine million, eight hundred fifty-nine thousand, six hundred thirty-nine".