61990240259 has 2 divisors, whose sum is σ = 61990240260. Its totient is φ = 61990240258.

The previous prime is 61990240241. The next prime is 61990240283. The reversal of 61990240259 is 95204209916.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61990240259 - 2¹⁶ = 61990174723 is a prime.

It is not a weakly prime, because it can be changed into another prime (61990240219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30995120129 + 30995120130.

It is an arithmetic number, because the mean of its divisors is an integer number (30995120130).

Almost surely, 2^61990240259 is an apocalyptic number.

61990240259 is a deficient number, since it is larger than the sum of its proper divisors (1).

61990240259 is an equidigital number, since it uses as much as digits as its factorization.

61990240259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 61990240259 in words is "sixty-one billion, nine hundred ninety million, two hundred forty thousand, two hundred fifty-nine".