261542450651 has 2 divisors, whose sum is σ = 261542450652. Its totient is φ = 261542450650.

The previous prime is 261542450627. The next prime is 261542450711. The reversal of 261542450651 is 156054245162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261542450651 - 2²² = 261538256347 is a prime.

It is a super-3 number, since 3×261542450651³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261542450599 and 261542450608.

It is not a weakly prime, because it can be changed into another prime (261542450951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130771225325 + 130771225326.

It is an arithmetic number, because the mean of its divisors is an integer number (130771225326).

Almost surely, 2^261542450651 is an apocalyptic number.

261542450651 is a deficient number, since it is larger than the sum of its proper divisors (1).

261542450651 is an equidigital number, since it uses as much as digits as its factorization.

261542450651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288000, while the sum is 41.

The spelling of 261542450651 in words is "two hundred sixty-one billion, five hundred forty-two million, four hundred fifty thousand, six hundred fifty-one".