261665112522146 has 32 divisors (see below), whose sum is σ = 410924919605760. Its totient is φ = 124728111199296.

The previous prime is 261665112522131. The next prime is 261665112522161. The reversal of 261665112522146 is 641225211566162.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (261665112522131) and next prime (261665112522161).

It is a super-2 number, since 2×261665112522146² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261665112522094 and 261665112522103.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84053015 + ... + 87110501.

It is an arithmetic number, because the mean of its divisors is an integer number (12841403737680).

Almost surely, 2^{261665112522146} is an apocalyptic number.

261665112522146 is a deficient number, since it is larger than the sum of its proper divisors (149259807083614).

261665112522146 is a wasteful number, since it uses less digits than its factorization.

261665112522146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3063698.

The product of its digits is 2073600, while the sum is 50.

The spelling of 261665112522146 in words is "two hundred sixty-one trillion, six hundred sixty-five billion, one hundred twelve million, five hundred twenty-two thousand, one hundred forty-six".