61435509659 has 2 divisors, whose sum is σ = 61435509660. Its totient is φ = 61435509658.

The previous prime is 61435509647. The next prime is 61435509713. The reversal of 61435509659 is 95690553416.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61435509659 - 2⁴ = 61435509643 is a prime.

It is a super-2 number, since 2×61435509659² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61435509659.

It is not a weakly prime, because it can be changed into another prime (61435509859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30717754829 + 30717754830.

It is an arithmetic number, because the mean of its divisors is an integer number (30717754830).

Almost surely, 2^61435509659 is an apocalyptic number.

61435509659 is a deficient number, since it is larger than the sum of its proper divisors (1).

61435509659 is an equidigital number, since it uses as much as digits as its factorization.

61435509659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374000, while the sum is 53.

The spelling of 61435509659 in words is "sixty-one billion, four hundred thirty-five million, five hundred nine thousand, six hundred fifty-nine".