61990240255 has 16 divisors (see below), whose sum is σ = 75502440000. Its totient is φ = 48854361600.

The previous prime is 61990240241. The next prime is 61990240259. The reversal of 61990240255 is 55204209916.

It is not a de Polignac number, because 61990240255 - 2¹⁷ = 61990109183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61990240259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207930 + ... + 408919.

It is an arithmetic number, because the mean of its divisors is an integer number (4718902500).

Almost surely, 2^61990240255 is an apocalyptic number.

61990240255 is a deficient number, since it is larger than the sum of its proper divisors (13512199745).

61990240255 is a wasteful number, since it uses less digits than its factorization.

61990240255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617154.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 61990240255 in words is "sixty-one billion, nine hundred ninety million, two hundred forty thousand, two hundred fifty-five".