261553242650416 has 40 divisors (see below), whose sum is σ = 509435684100864. Its totient is φ = 130086031395840.

The previous prime is 261553242650317. The next prime is 261553242650423. The reversal of 261553242650416 is 614056242355162.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65893570 + ... + 69750046.

Almost surely, 2^{261553242650416} is an apocalyptic number.

It is an amenable number.

261553242650416 is a deficient number, since it is larger than the sum of its proper divisors (247882441450448).

261553242650416 is a wasteful number, since it uses less digits than its factorization.

261553242650416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3878869 (or 3878863 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 52.

The spelling of 261553242650416 in words is "two hundred sixty-one trillion, five hundred fifty-three billion, two hundred forty-two million, six hundred fifty thousand, four hundred sixteen".