261415476361249 has 32 divisors (see below), whose sum is σ = 315303239808000. Its totient is φ = 211725101150784.

The previous prime is 261415476361241. The next prime is 261415476361253. The reversal of 261415476361249 is 942163674514162.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 261415476361249 - 2³ = 261415476361241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261415476361241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170632762 + ... + 172157980.

It is an arithmetic number, because the mean of its divisors is an integer number (9853226244000).

Almost surely, 2^{261415476361249} is an apocalyptic number.

It is an amenable number.

261415476361249 is a deficient number, since it is larger than the sum of its proper divisors (53887763446751).

261415476361249 is a wasteful number, since it uses less digits than its factorization.

261415476361249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528597.

The product of its digits is 52254720, while the sum is 61.

The spelling of 261415476361249 in words is "two hundred sixty-one trillion, four hundred fifteen billion, four hundred seventy-six million, three hundred sixty-one thousand, two hundred forty-nine".