261554040603151 has 2 divisors, whose sum is σ = 261554040603152. Its totient is φ = 261554040603150.

The previous prime is 261554040603137. The next prime is 261554040603157. The reversal of 261554040603151 is 151306040455162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261554040603151 is a prime.

It is a super-2 number, since 2×261554040603151² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261554040603098 and 261554040603107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261554040603157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130777020301575 + 130777020301576.

It is an arithmetic number, because the mean of its divisors is an integer number (130777020301576).

Almost surely, 2^{261554040603151} is an apocalyptic number.

261554040603151 is a deficient number, since it is larger than the sum of its proper divisors (1).

261554040603151 is an equidigital number, since it uses as much as digits as its factorization.

261554040603151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 261554040603151 in words is "two hundred sixty-one trillion, five hundred fifty-four billion, forty million, six hundred three thousand, one hundred fifty-one".