261666375446151 has 24 divisors (see below), whose sum is σ = 407411042904320. Its totient is φ = 160877324235456.

The previous prime is 261666375446107. The next prime is 261666375446207. The reversal of 261666375446151 is 151644573666162.

It is not a de Polignac number, because 261666375446151 - 2⁹ = 261666375445639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261666375448151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1028605456 + ... + 1028859813.

Almost surely, 2^{261666375446151} is an apocalyptic number.

261666375446151 is a deficient number, since it is larger than the sum of its proper divisors (145744667458169).

261666375446151 is a wasteful number, since it uses less digits than its factorization.

261666375446151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2057466375 (or 2057466372 counting only the distinct ones).

The product of its digits is 130636800, while the sum is 63.

The spelling of 261666375446151 in words is "two hundred sixty-one trillion, six hundred sixty-six billion, three hundred seventy-five million, four hundred forty-six thousand, one hundred fifty-one".